PHP function library (overview)-PHP Tutorial-php.cn

Array function:

array_change_key_case — Returns an array whose string keys are all lowercase or uppercase
array_chunk — Splits an array into multiple
array_column — Returns a specified column in the array
array _combine — create An array, using the value of one array as its key name, 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 — calculates the difference of the array with index check
array_diff_key — Use key name comparison to calculate the difference set of the array
array_diff_uassoc — Use the user-provided callback function to do index checking to calculate the difference set of the array
array_diff_ukey — Use the callback function to compare the key name Array Difference
array_diff — Calculates the difference of an array
array_fill_keys — Fills the array with the specified keys and values
array_fill — Fills the array with the given value
array_filter — Use callback Function to filter cells in an array
array_flip — Swap keys and values in an array
array_intersect_assoc — Calculate the intersection of arrays with index checking
array_intersect_key — Calculate the intersection of arrays using key name comparison
array_intersect_uassoc — Calculate the intersection of arrays with index checking, use callback functions to compare indexes
array_intersect_ukey — Use callback functions to compare key names to calculate the intersection of arrays
array_intersect — Calculate the intersection of arrays
array_key_exists — Check to Whether the specified key or index exists in the array
array_keys — Returns some or all of the key names in the array
array_map — Apply the callback function to the cells of the given array
array_merge_recursive — Recursively merge one or more arrays
array_merge — Merge one or more arrays
array_multisort — Sort multiple arrays or multidimensional arrays
array_pad — Pad arrays with values to a specified length
array_pop — Pop the last element of the array (pop)
array_product — Calculate the product of all values in the array
array_push — Push one or more cells to the end of the array (push)
array_rand — Randomly remove one or more elements from an array
array_reduce — Use a callback function to iteratively reduce an array to a single value*
array_replace_recursive — Recursively replace the first array with the passed array elements of *
array_replace — Replace elements of the first array with the passed array *
array_reverse — Return an array with the cells in reverse order
array_search — Search the array for a given value if If successful, return the corresponding key name
array_shift — Move the unit at the beginning of the array out of the array *
array_slice — Take out a section from the array
array_splice — Remove a part of the array and replace it with other values*
array_sum — Calculate the sum of all values in the array
array_udiff_assoc — Calculate the difference set of the array with index check, use the callback function to compare the data
array_udiff_uassoc — Calculate the difference set of the array with index check, use the callback function Compare data and index
array_udiff — Use callback function to compare data to calculate the difference set of arrays
array_uintersect_assoc — Calculate the intersection of arrays with index check, use callback function to compare data
array_uintersect_uassoc — Calculate with index check Intersection of arrays, use callback function to compare data and index
array_uintersect — Calculate intersection of arrays, use callback function to compare data
array_unique — Remove duplicate values in the array
array_unshift — Insert at the beginning of the array One or more cells
array_values — Returns all values in the array
array_walk_recursive — Recursively applies the user function * to each member in the array
array_walk — Uses a user-defined function to Do callback processing for each element*
array — Create a new array
arsort — Reverse sort the array and maintain the index relationship*
asort — Sort the array and maintain the index relationship
compact — Create an array, including variable names and their values*
count — Count the number of cells in the array or the number of attributes in the object
current — Returns the current element in the array
each — Returns the current key/value pair in the array and moves the array pointer forward one step*
end — Points the internal pointer of the array to the last element
extract — Import variables from an array into the current symbol table*
in_array — Check whether a value exists in an array
key_exists — Alias array_key_exists
key — Get from an associative array Key name
krsort — Sort the array in reverse order by the key name
ksort — Sort the array according to the key name
list — Assign the values in the array to some variables*
natcasesort — Use The "natural sort" algorithm sorts the array case-insensitively
natsort — Sorts the array using the "natural sort" algorithm*
next — Moves the internal pointer in the array forward by one
pos — Alias of current
prev — Rewind the internal pointer of the array by one bit *
range — Create an array containing the specified range unit
reset — Point the internal pointer of the array to the A unit *
rsort — Sort the array in reverse order
shuffle — Shuffle the array
sizeof — Alias of count
sort — Sort the array
uasort — user Custom comparison function sorts the values in the array and maintains index association*
uksort — Uses the user-defined comparison function to sort the keys in the array
usort — Uses the user-defined comparison Function to sort the values in an array

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String functions:

addcslashes — Use backslashes to escape characters in a string in C language style
addslashes — Use backslashes to quote strings *
bin2hex — Function to convert a string of ASCII characters to Hexadecimal value
chop — Alias for rtrim
chr — Returns the specified character Convert characters to another
convert_uudecode — Decode a uuencode-encoded string
convert_uuencode — Use uuencode to encode a string
count_chars — Return information about the characters used in the string
crc 32 — Calculate 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 — Return 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 characters to HTML entities
implode — Convert the value of a one-dimensional array into a string
sscanf — Parse the input characters according to the specified format
str_getcsv — Parse the CSV string into an array
str_ireplace — A case-ignoring version of str_replace
str_pad — Use another string to fill the characters The string is the specified length*
str_repeat — Repeat a string
str_replace — Substring replacement
str_rot13 — Perform ROT13 conversion on the string
str_shuffle — Randomly shuffle a string
str_split — Convert the string into an array*
str_word_count — Return the usage of words in the string
strcasecmp — Binary safe comparison of strings (not Case sensitive)
strchr — alias strstr
strcmp — Binary safe string comparison*
strcoll — Locale-based string comparison*
strcspn — Get mismatch mask Length of starting substring*
strip_tags — strip HTML and PHP tags from a string Where it appears (case-insensitive)
stripslashes — dereference a quoted string
stristr — a case-ignoring version of the strstr function
strlen — get the string length
strnatcasecmp — Compare strings using the "natural ordering" algorithm (case-insensitive)
strnatcmp — Compare strings using the 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 set of characters in a string*
strpos — Find the first occurrence of a string*
strrchr — Find the last occurrence of the specified character in the string *
strrev — Reverse the 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 first paragraph in the string where all characters exist in the specified character set The length of the string*
strstr — Find the first occurrence of the string *
strtok — Mark the split string *
strtolower — Convert the string to lowercase
strtoupper — Convert the string To uppercase
strtr — Convert the specified character *
substr_compare — Binary safe comparison of strings (compare the specified length from offset position)
substr_count — Count the number of occurrences of a string
substr_replace — Replace the substring of the string
substr — Return the substring of the string
trim — Remove the 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 the string to uppercase *
vfprintf — Write the formatted string to the stream
vprintf — Output the formatted string
vsprintf — Returns a formatted string
wordwrap — Breaks the string into a specified number of words*
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JSON function:

json_decode — Encode a string in JSON format

json_encode — Encode variables in JSON

json_last_error_msg — Returns the error string of the last json_encode() or j son_decode( ) call
json_last_error — Returns the last error that occurred
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URL function:

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

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Session function:

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 the cache limiter
session_commit — Alias of session_write_close
session_decode — Decode session data
session_destroy — Destroy a All data in the session
session_encode — Encode the current session data into a string
session_get_cookie_params — Get the session cookie parameters
session_id — Get/set the current session ID
session_is _registered — check variables Whether it is already registered in the session
session_module_name — Get/set the session module name
session_name — Read/set the session name
session_regenerate_id — Use the newly generated session ID to update the existing session ID
_Session_register_shutdown — Close the session
Session_register — register one or more global variables with the current session
session_reset — Re-Initialize Session Y With Original Values
session_SAVE_PATH — Reading/Set the preservation 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

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Classes/Object function:

__autoload — Attempt to load an undefined class
call_user_method_array — Call a user method while passing an array of parameters (deprecated)
call_user_method — Call a user method on a specific object (deprecated)
class_alias — Create an alias for a class
class_exists — Check if the class is defined
get_called_class — Late static binding ("Late Static Binding") The name of the class
get_class_methods — Return the methods of the class Array of names
get_class_vars — Returns an array of default attributes of the class
get_class — Returns the class name of the object
get_declared_classes — Returns an array of 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 composed of object attributes
get_parent_class — Return object or class The parent class name
interface_exists — Check whether the interface has been defined
is_a — Return TRUE if the object belongs to this class or the class is the parent class of this object
is_subclass_of — If this object is the If it is a subclass of the class, TRUE will be returned
method_exists — Check whether the method of the class exists
property_exists — Check whether the object or class has the property
trait_exists — Check whether the specified trait exists

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MySQL functions:

mysql_affected_rows — Get the number of record rows affected by the previous MySQL operation
mysql_client_encoding — Return the name of the character set
mysql_close — Close the MySQL connection
mysql_connect — Open a connection to a MySQL server
mysql_create_db — Create a new MySQL database
mysql_data_seek — Move the internal result pointer
mysql_db_name — Get the result data
mysql_db _query — Send a MySQL query
mysql_drop_db — Drop (delete) A MySQL database
mysql_errno — Returns the numeric encoding 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 — Escapes a string for mysql_query
mysql_fetch_array — Get a row from the result set as an associative array, or a numeric array, or both
mysql_fetch_assoc — Get a row from the result set as an associative array
mysql_fetch_field — From the result Get columns centrally information and returned 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 — Return the length of the specified field
mysql_field_name — Get the field name of the specified field in the result
mysql_field_seek — Concentrate the results pointer set 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 the 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 the fields in the MySQL result
mysql_list_processes — List MySQL processes
mysql_list_tables — List the 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 link to My Persistent connection to SQL server
mysql_ping — Ping a server connection, reconnect if not connected
mysql_query — Send a MySQL query
mysql_real_escape_string — Escape special characters in strings used in SQL statements, taking into account the connection Current character set
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 an SQL query to MySQL without retrieving and caching the result rows

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Math function:

abs — absolute value
acos — inverse cosine
acosh — inverse hyperbolic cosine
asin — inverse sine
asinh — inverse hyperbola Sine
atan2 — Arctangent of two parameters
atan — arctangent
atanh — inverse hyperbolic tangent
base_convert — convert numbers between arbitrary bases
bindec — convert binary to decimal
ceil — Rounding to one
cos — Cosine
cosh — Hyperbolic cosine
decbin — Convert decimal to binary
dechex — Convert decimal to Hexadecimal
decoct — Convert decimal to octal
deg2rad — Convert angle to radians
exp — Calculate the exponent of e
expm1 — Return exp(number) - 1, even when the value of number is close to zero It can also calculate accurate results
floor — Rounding by rounding method
fmod — Returns the floating point remainder of division
getrandmax — Displays the largest possible value of a random number
hexdec — Sixteen Convert base 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 it is an infinite value
is_nan — Determine whether it is a legal value
lcg_value — Combined linear congruential generator
log10 — Logarithm with base 10
log1p — Return log(1 + number), even Accurate results can be calculated when the value of number is close to zero
log — natural logarithm
max — find the maximum value
min — find the minimum value
mt_getrandmax — display random numbers Maximum possible value of
mt_rand — Generate better random numbers
mt_srand — Seed a better random number generator
octdec — Convert octal to decimal
pi — Get 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 — sow the random number generator seed
tan — tangent
tanh — hyperbolic tangent

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Date/Time function:

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 all values in a script Default time zone used by datetime functions
date_default_timezone_set — Set the default time zone 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::setISOD ate
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 a given date and location Sunset time
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 — GMT /UTC date/time
gmmktime — Get UNIX timestamp of GMT date
gmstrftime — Format GMT/UTC time/date according to locale
idate — Format local time date into integer
localtime — Get the local time
microtime — Return the current Unix timestamp and microseconds
mktime — Get the Unix timestamp of a date
strftime — Format local time according to regional settings／ date
strptime — Parse the date/time generated by strftime
strtotime — Parse any English text datetime description into a Unix timestamp
time — Return 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

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