Summary introduction to PHP String function_PHP tutorial-PHP Tutorial-php.cn

The htmlentities() function of PHP String function converts characters into HTML entities.

html_entity_decode() function converts HTML entities into characters.

hebrevc() function converts Hebrew text from right-to-left flow to left-to-right flow. It will also convert newlines (n) to
.

hebrev() function converts Hebrew text from right-to-left flow to left-to-right flow.

The get_html_translation_table() function returns the translation table used by the htmlentities() and htmlspecialchars() functions.

The fprintf() function writes a formatted string to the specified output stream (for example: file or database).

explode() function splits a string into an array.

The echo() function of PHP String function outputs one or more strings.

The crypt() function returns a string encrypted using DES, Blowfish or MD5.

crc32() function calculates the crc32 polynomial of a string.

count_chars() function returns information about the characters used in a string.

The convert_uuencode() function uses the uuencode algorithm to encode a string.

The convert_uudecode() function of the PHP String function decodes the uuencode-encoded string.

convert_cyr_string() function converts characters from one Cyrillic character to another.

The chunk_split() function splits a string into a series of smaller parts. The

chr() function returns a character from a specified ASCII value.

chop() function removes whitespace characters or other predefined characters starting from the end of a string.

bin2hex() function converts a string of ASCII characters into a hexadecimal value.

The addslashes() function of PHP String function adds a backslash before the specified predefined characters.

addcslashes() function adds a backslash before the specified character.

The xpath() function runs an XPath query against an XML document.

The simplexml_load_string() function loads an XML string into an object.

The simplexml_load_file() function loads an XML document into an object.

The simplexml_import_dom() function of PHP String function converts DOM nodes into SimpleXMLElement objects.

registerXPathNamespace() function creates a namespace context for the next XPath query.

getNamespace() function gets the namespace used in the XML document.

getName() function gets the name of an XML element from a SimpleXMLElement object.

The getDocNamespaces() function returns the namespaces declared in the XML document from a SimpleXMLElement object.

children() function gets the child nodes of the specified node. The

attributes() function gets the attributes of a SimpleXML element.

The asXML() function of PHP String function returns the XML document from the SimpleXMLElement object in the form of a string.

addChild() function adds a child node to the specified XML node.

addAttribute() function adds an attribute to a SimpleXML element.

__construct() function creates a new SimpleXMLElement object.

The mysql_unbuffered_query() function sends an SQL query to MySQL (without getting/caching the results).

The mysql_thread_id() function returns the ID of the current thread.

The mysql_stat() function returns the current system status of the MySQL server.

The mysql_select_db() function sets the active MySQL database.

The mysql_result() function of PHP String function returns the value of a field in the result set.

The mysql_real_escape_string() function escapes special characters in strings used in SQL statements.

The mysql_query() function executes a MySQL query.

mysql_ping() function Pings a server connection and reconnects if there is no connection.

The mysql_pconnect() function opens a persistent connection to the MySQL server.

The mysql_num_rows() function returns the number of rows in the result set.

The mysql_num_fields() function returns the number of fields in the result set.

The mysql_list_processes() function lists MySQL processes.

The mysql_list_dbs() function of PHP String function lists all databases in the MySQL server.

The mysql_insert_id() function returns the ID generated by the previous INSERT operation.

The mysql_info() function returns the information of the latest query.

The mysql_get_server_info() function returns the MySQL server information.

The mysql_get_proto_info() function returns MySQL protocol information.

The mysql_get_host_info() function returns the MySQL host information.

The mysql_get_client_info() function of PHP String function returns MySQL client information.

The mysql_free_result() function releases the result memory.

The mysql_field_type() function returns the type of the specified field in the result set.

The mysql_field_table() function returns the table name where the specified field is located.

The mysql_field_seek() function sets the pointer in the result set to the specified field offset.

The mysql_field_name() function gets the field name of the specified field in the result.

The mysql_field_len() function returns the length of the specified field.

The mysql_field_flags() function of PHP String function obtains the flags associated with the specified field from the result.

The mysql_fetch_row() function fetches a row from the result set as a numeric array.

The mysql_fetch_object() function fetches a row as an object from the result set (record set).

The mysql_fetch_lengths() function gets the length of the content of each field in a row.

The mysql_fetch_field() function obtains column information from the result set and returns it as an object.

The mysql_fetch_assoc() function fetches a row from the result set as an associative array.

PHP String function mysql_fetch_array() function gets a row from the result set as an associative array, a numeric array, or both

mysql_error() function returns the text generated by the previous MySQL operation error message.

The mysql_errno() function returns the numeric code of the error message in the previous MySQL operation.

The mysql_db_name() function obtains the database name returned by the mysql_list_dbs() call.

The mysql_data_seek() function moves the pointer of the internal result.

The mysql_connect() function opens a non-persistent MySQL connection.

The mysql_close() function closes non-persistent MySQL connections.

The mysql_client_encoding() function returns the name of the character set for the current connection.

The mysql_affected_rows() function of PHP String function returns the number of record rows affected by the previous MySQL operation.

tanh() function returns the hyperbolic tangent.

tan() function returns tangent. The

srand() function seeds the random number generator.

sqrt() function returns the square root of a number.

The sinh() function of PHP String function returns the hyperbolic sine of a number.

sin() function returns the sine of a number.

round() function rounds floating point numbers.

rand() function returns a random integer.

rad2deg() function converts radians to degrees.

The pow() function of PHP String function returns x raised to the yth power.

pi() function returns the value of pi.

octdec() function converts octal to decimal.

mt_srand() seeds the Mersenne Twister random number generator.

mt_rand() returns a random integer using the Mersenne Twister algorithm.

mt_getrandmax() displays the maximum possible value of a random number.

min() returns the minimum value.

max() returns the maximum value.

Log1p() of PHP String function returns log(1 + x), and the accurate result can be calculated even when the value of x is close to zero.

log10() Base 10 logarithm.

log() returns the natural logarithm.

lcg_value() Combined linear congruential generator.

is_nan() determines whether it is a legal value.

is_infinite() determines whether it is infinite.

is_finite() function determines whether it is a finite value.

hypot() function calculates the length of the hypotenuse of a right triangle.

The hexdec() function of PHP String function converts hexadecimal to decimal.

fmod() function displays the largest possible value of a random number.

fmod() function returns the floating point remainder of division.

floor() function rounds down to the nearest integer.

expm1() function returns exp(x) - 1, which can be calculated accurately even when the value of number is close to zero.

exp() function calculates the exponent of e.

The deg2rad() function of PHP String function converts angles to radians.

decoct() function converts decimal to octal.

dechex() function converts decimal to hexadecimal.

The decbin() function converts decimal to binary.

cosh() function returns the hyperbolic cosine of a number.

cos() function returns the cosine of a number.

ceil() function rounds up to the nearest integer.

bindec() function converts binary to decimal.

base_convert() function converts numbers between arbitrary bases.

atanh() function returns the inverse hyperbolic tangent of an angle.

PHP String function atan() and atan2() and atan2() function

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