PHP function library (overview), php function library overview_PHP tutorial

PHP function library (overview), PHP function library overview

• array_change_key_case — Returns an array whose string keys are all lowercase or uppercase
• array_chunk — Split an array into multiple
• array_column — Returns a specified column in the array
• array_combine — Create an array with the value of one array as its key and the value of the other array as its value
• array_count_values ​​— counts the number of occurrences of all values ​​in the array
• array_diff_assoc — Computes the difference of an array with index checking
• array_diff_key — Computes the difference of an array using key name comparison
• array_diff_uassoc — Calculate the difference of an array using a user-provided callback function to do index checking
• array_diff_ukey — Use the callback function to compare the key names to calculate the difference set of the array
• array_diff — Calculate the difference of arrays
• array_fill_keys — Fills an array
with specified keys and values
• array_fill — fills an array
with the given value
• array_filter — Use callback function to filter the cells in the array
• array_flip — swap keys and values ​​in an array
• array_intersect_assoc — Compute the intersection of arrays with index checking
• array_intersect_key — Computes the intersection of arrays using key name comparison
• array_intersect_uassoc — Calculate the intersection of arrays with index checking, use callback function to compare indexes
• array_intersect_ukey — Use callback function to compare key names to calculate the intersection of arrays
• array_intersect — Calculate the intersection of arrays
• array_key_exists — Checks whether a given key or index exists in an array
• array_keys — Returns some or all key names in the array
• array_map — Apply the callback function to the cells of the given array
• array_merge_recursive — Merge one or more arrays recursively
• array_merge — merge one or more arrays
• array_multisort — Sort multiple arrays or multidimensional arrays
• array_pad — pad the array to the specified length with values
• array_pop — pop the last element of the array
• array_product — Calculates the product of all values ​​in an array
• array_push — push one or more elements to the end of the array (push)
• array_rand — Randomly remove one or more cells from the array
• array_reduce — Iteratively reduce an array to a single value using a callback function*
• array_replace_recursive — Recursively replace the elements of the first array with the passed array*
• array_replace — Replace the elements of the first array with the passed array *
• array_reverse — Returns an array with the cells in reverse order
• array_search — Search for a given value in an array, and return the corresponding key name if successful
• array_shift — Move the element at the beginning of the array out of the array *
• array_slice — Remove a segment from the array
• array_splice — remove part of an array and replace it with other values ​​*
• array_sum — Calculates the sum of all values ​​in an array
• array_udiff_assoc — Calculate the difference set of arrays with index checking, use callback function to compare data
• array_udiff_uassoc — Calculate the difference set of the array with index check, use callback function to compare the data and index
• array_udiff — Use callback function to compare data to calculate the difference of arrays
• array_uintersect_assoc — Calculate the intersection of arrays with index checking, use callback function to compare data
• array_uintersect_uassoc — Calculate the intersection of arrays with index checking, use callback function to compare data and index
• array_uintersect — Calculate the intersection of arrays and use callback functions to compare data
• array_unique — Remove duplicate values ​​from an array
• array_unshift — Insert one or more cells at the beginning of the array
• array_values ​​— Returns all values ​​in the array
• array_walk_recursive — Recursively apply user functions *
to each member of an array
• array_walk — Use user-defined functions to perform callback processing on each element in the array *
• array — Create a new array
• arsort — sort an array in reverse order and maintain index relationships *
• asort — Sort an array and maintain index relationship
• compact — Create an array including variable names and their values ​​*
• count — Count the number of cells in an array or the number of attributes in an object
• current — Returns the current cell in the array
• each — Returns the current key/value pair in the array and moves the array pointer forward one step *
• end — Point the internal pointer of the array to the last element
• extract — Import variables from the array into the current symbol table *
• in_array — Check whether a value exists in the array
• key_exists — alias array_key_exists
• key — Get the key name from the associative array
• krsort — Sort the array in reverse order by key name
• ksort — Sort array by key name
• list — Assign the values ​​in the array to some variables *
• natcasesort — Sort an array case-insensitively using the "natural sorting" algorithm
• natsort — Sort an array using the "natural sorting" algorithm *
• next — Move the internal pointer in the array forward one position
• pos — alias for current
• prev — Rewind the internal pointer of the array one bit *
• range — Create an array containing cells in the specified range
• reset — Point the internal pointer of the array to the first element *
• rsort — Sort the array in reverse order
• shuffle — shuffle the array
• sizeof — alias for count
• sort — Sort an array
• uasort — Sort values ​​in an array using a user-defined comparison function and keep index associations *
• uksort — Sort keys in an array using a user-defined comparison function
• usort — Sort values ​​in an array using a user-defined comparison function

• addcslashes — Escape characters in a string using backslashes in C style
• addslashes — Use backslashes to quote strings *
• bin2hex — Function converts a string of ASCII characters into a hexadecimal value
• chop — alias for rtrim
• chr — Returns the specified character *
• chunk_split — Split a string into small chunks
• convert_cyr_string — Convert characters from one Cyrillic character to another
• convert_uudecode — Decode a uuencode-encoded string
• convert_uuencode — Use uuencode to encode a string
• count_chars — Returns information about the characters used in the string
• crc32 — Calculates the crc32 polynomial of a string *
• crypt — One-way string hash *
• echo — Output one or more strings
• explode — Use one string to split another string *
• fprintf — Write the formatted string to the stream
• get_html_translation_table — Returns the translation table using htmlspecialchars and htmlentities *
• hebrev — Convert logical-Hebrew to visual-Hebrew
• hebrevc — Convert logical-Hebrew to visual-Hebrew and convert newlines
• hex2bin — Convert hexadecimal string to binary string
• html_entity_decode — Convert all HTML entities to their applicable characters
• htmlentities — Convert all applicable characters to HTML entities
• htmlspecialchars_decode — Convert special HTML entities back to normal characters *
• htmlspecialchars — Convert special characters to HTML entities
• implode — Convert the value of a one-dimensional array into a string *
• join — alias implode
• lcfirst — Make the first character of a string lowercase
• levenshtein — Calculate the edit distance between two strings *
• localeconv — Get numeric formatting information
• ltrim — remove whitespace characters (or other characters) at the beginning of a string
• md5_file — Calculate the MD5 hash value of the specified file
• md5 — Calculate the MD5 hash value of a string *
• metaphone — Calculate the metaphone key of a string
• money_format — Formats a number as a currency string
• nl_langinfo — Query language and locale information
• nl2br — Insert an HTML newline mark before all new lines in the string *
• number_format — Format a number with thousand separators *
• ord — Returns the ASCII code value of the character *
• parse_str — Parse a string into multiple variables
• print — output string
• printf — Output formatted string
• quoted_printable_decode — Convert quoted-printable string to 8-bit string
• quoted_printable_encode — Convert 8-bit string to quoted-printable string
• quotemeta — escape metacharacter set *
• rtrim — removes whitespace characters (or other characters) at the end of a string
• setlocale — Set region information
• sha1_file — Calculate the sha1 hash value of a file
• sha1 — Calculates the sha1 hash value of a string
• similar_text — Calculate the similarity of two strings *
• soundex — Calculate the soundex key of a string
• sprintf — Return a formatted string
• sscanf — Parse input characters according to the specified format
• str_getcsv — Parse a CSV string into an array
• str_ireplace — case-ignoring version of str_replace
• str_pad — pad a string with another string to the specified length *
• str_repeat — Repeat a string
• str_replace — Substring replacement
• str_rot13 — performs a ROT13 conversion on a string
• str_shuffle — Randomly shuffle a string
• str_split — Convert a string to an array *
• str_word_count — Returns the usage of words in the string
• strcasecmp — Binary safe comparison of strings (case insensitive)
• strchr — alias strstr
• strcmp — Binary safe string comparison *
• strcoll — Locale-based string comparison *
• strcspn — Get the length of the starting substring of the unmatched mask *
• strip_tags — Strip HTML and PHP tags from strings *
• stripcslashes — dequote a string escaped using addcslashes
• stripos — Find the first occurrence of a string (case-insensitive)
• stripslashes — backquote a quoted string
• stristr — A case-ignoring version of the strstr function
• strlen — Get the string length
• strnatcasecmp — Compare strings using the "natural order" algorithm (case-insensitive)
• strnatcmp — Compare strings using natural ordering algorithm
• strncasecmp — Binary safe comparison of several characters at the beginning of a string (case-insensitive)
• strncmp — Binary safe comparison of several characters at the beginning of a string *
• strpbrk — Find any character in a string *
• strpos — Find the first occurrence of a string *
• strrchr — Find the last occurrence of a specified character in a string *
• strrev — Reverse a string *
• strripos — Calculate the position of the last occurrence of the specified string in the target string (case-insensitive)
• strrpos — Calculate the position of the last occurrence of the specified string in the target string *
• strspn — Calculate the length of the first substring in a string in which all characters exist in the specified character set*
• strstr — Find the first occurrence of a string *
• strtok — tag split string *
• strtolower — Convert string to lowercase
• strtoupper — Convert a string to uppercase
• strtr — Convert the specified character *
• substr_compare — Binary safe comparison of strings (specified length compared from offset position)
• substr_count — Count the number of occurrences of a string
• substr_replace — Replace a substring of a string
• substr — Returns the substring of a string
• trim — Remove blank characters (or other characters) at the beginning and end of the string
• ucfirst — Convert the first letter of the string to uppercase
• ucwords — Convert the first letter of each word in a string to uppercase *
• vfprintf — Write formatted string to stream
• vprintf — Output formatted string
• vsprintf — Returns the formatted string
• wordwrap — breaks a string into a specified number of words *

• json_decode — Encode a string in JSON format
• json_encode — JSON encode variables
• json_last_error_msg — Returns the error string of the last json_encode() or json_decode() call
• json_last_error — Returns the last error that occurred

• base64_decode — Decode data encoded using MIME base64
• base64_encode — Encode data using MIME base64
• get_headers — Get all headers sent by the server in response to an HTTP request
• get_meta_tags — Extract all meta tag content attributes from a file and return an array
• http_build_query — Generate the request string after URL-encoding
• parse_url — Parse a URL and return its component parts
• rawurldecode — Decode an encoded URL string
• rawurlencode — Encode URLs according to RFC 1738
• urldecode — Decode an encoded URL string
• urlencode — Encode URL string

• session_abort — Discard session array changes and finish session
• session_cache_expire — Returns the expiration time of the current cache
• session_cache_limiter — Read/set cache limiter
• session_commit — alias of session_write_close
• session_decode — Decode session data
• session_destroy — Destroy all data in a session
• session_encode — Encode the current session data into a string
• session_get_cookie_params — Get session cookie parameters
• session_id — Get/set the current session ID
• session_is_registered — Checks whether the variable is registered in the session
• session_module_name — Get/set the session module name
• session_name — Read/set session name
• session_regenerate_id — Update an existing session ID with a newly generated session ID
• session_register_shutdown — Close session
• session_register — Register one or more global variables with the current session
• session_reset — Re-initialize session array with original values
• session_save_path — Read/set the save path of the current session
• session_set_cookie_params — Set session cookie parameters
• session_set_save_handler — Set user-defined session storage function
• session_start — Start a new session or reuse an existing session
• session_status — Returns the current session status
• session_unregister — Unregister a global variable from the current session
• session_unset — Free all session variables
• session_write_close — Write session data and end session

• __autoload — Attempts to load undefined class
• call_user_method_array — Call a user method, passing the parameter array (deprecated)
• call_user_method — Call a user method on a specific object (deprecated)
• class_alias — Create an alias for a class
• class_exists — Check whether the class is defined
• get_called_class — The name of the "Late Static Binding" class
• get_class_methods — Returns an array consisting of class method names
• get_class_vars — Returns an array consisting of the default attributes of the class
• get_class — Returns the class name of the object
• get_declared_classes — Returns an array consisting of the names of defined classes
• get_declared_interfaces — Returns an array containing all declared interfaces
• get_declared_traits — Returns an array of all defined traits
• get_object_vars — Returns an associative array consisting of object properties
• get_parent_class — Returns the parent class name of the object or class
• interface_exists — Check whether the interface has been defined
• is_a — Returns TRUE if the object belongs to this class or this class is the parent class of this object
• is_subclass_of — Returns TRUE if this object is a subclass of this class
• method_exists — Check whether a class method exists
• property_exists — Check whether an object or class has this property
• trait_exists — Check whether the specified trait exists

• mysql_affected_rows — Get the number of record rows affected by the previous MySQL operation
• mysql_client_encoding — Returns the name of the character set
• mysql_close — Close the MySQL connection
• mysql_connect — Open a connection to the MySQL server
• mysql_create_db — Create a new MySQL database
• mysql_data_seek — Move pointer to internal result
• mysql_db_name — Get result data
• mysql_db_query — Send a MySQL query
• mysql_drop_db — drop (delete) a MySQL database
• mysql_errno — Returns the numeric code of the error message in the previous MySQL operation
• mysql_error — Returns the text error message generated by the previous MySQL operation
• mysql_escape_string — Escape a string for mysql_query
• mysql_fetch_array — Fetch a row from the result set as an associative array, a numeric array, or both
• mysql_fetch_assoc — Get a row from the result set as an associative array
• mysql_fetch_field — Get column information from the result set and return it as an object
• mysql_fetch_lengths — Get the length of each output in the result set
• mysql_fetch_object — Get a row from the result set as an object
• mysql_fetch_row — Get a row from the result set as an enumeration array
• mysql_field_flags — Get the flags associated with the specified field from the result
• mysql_field_len — Returns the length of the specified field
• mysql_field_name — Get the field name of the specified field in the result
• mysql_field_seek — Set the pointer in the result set to the specified field offset
• mysql_field_table — Get the table name where the specified field is located
• mysql_field_type — Get the type of the specified field in the result set
• mysql_free_result — Release result memory
• mysql_get_client_info — Get MySQL client information
• mysql_get_host_info — Get MySQL host information
• mysql_get_proto_info — Get MySQL protocol information
• mysql_get_server_info — Get MySQL server information
• mysql_info — Get the latest query information
• mysql_insert_id — Get the ID generated by the previous INSERT operation
• mysql_list_dbs — List all databases in the MySQL server
• mysql_list_fields — List fields in MySQL results
• mysql_list_processes — List MySQL processes
• mysql_list_tables — List tables in the MySQL database
• mysql_num_fields — Get the number of fields in the result set
• mysql_num_rows — Get the number of rows in the result set
• mysql_pconnect — Open a persistent connection to the MySQL server
• mysql_ping — Ping a server connection, reconnect if there is no connection
• mysql_query — Send a MySQL query
• mysql_real_escape_string — Escape special characters in a string used in a SQL statement, taking into account the current character set of the connection
• mysql_result — Get result data
• mysql_select_db — Select MySQL database
• mysql_set_charset — Set the client’s character set
• mysql_stat — Get the current system status
• mysql_tablename — Get the table name
• mysql_thread_id — Returns the ID of the current thread
• mysql_unbuffered_query — Sends a SQL query to MySQL without retrieving and caching the result rows

• abs — absolute value
• acos — inverse cosine
• acosh — inverse hyperbolic cosine
• asin — arcsine
• asinh — inverse hyperbolic sine
• atan2 — Arctangent of two parameters
• atan — Arctangent
• atanh — inverse hyperbolic tangent
• base_convert — Convert numbers between any bases
• bindec — Convert binary to decimal
• ceil — rounding to the nearest whole
• cos — cosine
• cosh — hyperbolic cosine
• decbin — Convert decimal to binary
• dechex — Convert decimal to hexadecimal
• decoct — Convert decimal to octal
• deg2rad — Convert angles to radians
• exp — Calculate the exponent of e
• expm1 — Returns exp(number) - 1, and can calculate accurate results even when the value of number is close to zero
• floor — Rounding by rounding
• fmod — Returns the floating point remainder of division
• getrandmax — displays the maximum possible value of a random number
• hexdec — Convert hexadecimal to decimal
• hypot — Calculate the length of the hypotenuse of a right triangle
• intdiv — Integer division
• is_finite — Determine whether it is a finite value
• is_infinite — Determine whether the value is infinite
• is_nan — Determine whether it is a legal value
• lcg_value — Combination Linear Congruential Generator
• log10 — base 10 logarithm
• log1p — returns log(1 number), and can calculate accurate results even when the value of number is close to zero
• log — natural logarithm
• max — Find the maximum value
• min — Find the minimum value
• mt_getrandmax — displays the maximum possible value of a random number
• mt_rand — Generate better random numbers
• mt_srand — Sowing the seeds for a better random number generator
• octdec — Convert octal to decimal
• pi — get the pi value
• pow — exponential expression
• rad2deg — Convert radians to corresponding degrees
• rand — Generate a random integer
• round — Round floating point numbers
• sin — sine
• sinh — hyperbolic sine
• sqrt — square root
• srand — Plant a random number generator seed
• tan — tangent
• tanh — hyperbolic tangent

• checkdate — Verify a Gregorian date
• date_add — alias DateTime::add
• date_create_from_format — alias DateTime::createFromFormat
• date_create_immutable_from_format — alias DateTimeImmutable::createFromFormat
• date_create_immutable — alias DateTimeImmutable::__construct
• date_create — alias DateTime::__construct
• date_date_set — alias DateTime::setDate
• date_default_timezone_get — Get the default time zone used by all date and time functions in a script
• date_default_timezone_set — Set the default timezone used for all datetime functions in a script
• date_diff — alias DateTime::diff
• date_format — alias DateTime::format
• date_get_last_errors — alias DateTime::getLastErrors
• date_interval_create_from_date_string — alias DateInterval::createFromDateString
• date_interval_format — alias DateInterval::format
• date_isodate_set — alias DateTime::setISODate
• date_modify — alias DateTime::modify
• date_offset_get — alias DateTime::getOffset
• date_parse_from_format — Get info about given date formatted according to the specified format
• date_parse — Returns associative array with detailed info about given date
• date_sub — alias DateTime::sub
• date_sun_info — Returns an array with information about sunset/sunrise and twilight begin/end
• date_sunrise — Returns the sunrise time for a given date and location
• date_sunset — Returns the sunset time for a given date and location
• date_time_set — alias DateTime::setTime
• date_timestamp_get — alias DateTime::getTimestamp
• date_timestamp_set — alias DateTime::setTimestamp
• date_timezone_get — alias DateTime::getTimezone
• date_timezone_set — alias DateTime::setTimezone
• date — Format a local time/date
• getdate — Get date/time information
• gettimeofday — Get the current time
• gmdate — Format a GMT/UTC date/time
• gmmktime — Get UNIX timestamp of GMT date
• gmstrftime — Format GMT/UTC time/date according to locale
• idate — Format local time and date into integers
• localtime — Get local time
• microtime — Returns the current Unix timestamp and microseconds
• mktime — Get the Unix timestamp of a date
• strftime — Format local time/date according to locale
• strptime — parse date/time generated by strftime
• strtotime — Parse any English text datetime description into a Unix timestamp
• time — Returns the current Unix timestamp
• timezone_abbreviations_list — alias DateTimeZone::listAbbreviations
• timezone_identifiers_list — alias DateTimeZone::listIdentifiers
• timezone_location_get — alias DateTimeZone::getLocation
• timezone_name_from_abbr — Returns the timezone name from abbreviation
• timezone_name_get — alias DateTimeZone::getName
• timezone_offset_get — alias DateTimeZone::getOffset
• timezone_open — alias DateTimeZone::__construct
• timezone_transitions_get — alias DateTimeZone::getTransitions
• timezone_version_get — Gets the version of the timezonedb