As shown below:

　　usleep()  The function delays code execution by several microseconds.
　　unpack()  Function from 2 The base string unpacks data.
　　uniqid()  The function is generated based on the current time in microseconds 1 A wei 1 the  ID .
　　time_sleep_until()  The function delays code execution until a specified time.
　　PHP5 Common function of time_nanosleep()  The function delays code execution by several seconds and nanoseconds.
　　sleep()  The function delays code execution by several seconds.
　　show_source()  Function syntax highlighting the file.
　　strip_whitespace()  The function returns deleted  PHP  Comments and whitespace characters in the source code file.
　　pack()  The function loads the data 1 a 2 Base string.
　　ignore_user_abort()  The function sets whether disconnection from the client terminates the execution of the script.
　　highlight_string()  Function syntax highlighting a string.
　　highlight_file()  Function syntax highlighting the file.
　　PHP5 Common function of get_browser()  Function returns the performance of the user's browser.
　　exit()  Output function 1 Message and exit the current script.
　　eval()  The function follows the string  PHP  Code to calculate.
　　die()  Output function 1 Message and exit the current script.
　　defined()  The function checks whether a constant exists.
　　define()  The function definitions 1 A constant.
　　constant()  The function returns the value of a constant.
　　PHP5 Common function of connection_status()  Function returns the current connection status.
　　connection_aborted()  The function checks to see if the client is disconnected.
　　zip_read()  The function reads open  zip  Under the file 1 A file.
　　zip_open()  Function to open the  ZIP  File for reading.
　　zip_entry_read()  Function from open  zip  Gets the content in a file project.
　　zip_entry_open()  Function to open the 1 a  ZIP  File items for reading.
　　PHP5 Common function of zip_entry_name()  The function returns  zip  The name of the file project.
　　zip_entry_filesize()  The function returns  zip  The original size of the file item ( Before I compress it ) .
　　zip_entry_compressionmethod()  The function returns  zip  Compression of file items.
　　zip_entry_compressedsize()  The function returns  zip  Compressed file size for file items.
　　zip_entry_close()  Function closed by  zip_entry_open()  Function open  zip  File file.
　　zip_close()  Function closed by  zip_open()  Function open  zip  File file.
　　xml_set_unparsed_entity_decl_handler()  The function specifies an entity name that cannot be resolved when encountered (NDATA) The function that is called at declaration time.
　　xml_set_processing_instruction_handler()  The function specifies when the parser is in  XML  The function called when the processing instruction is found in the document.
　　xml_set_object()  Functions are allowed in objects  XML  The parser.
　　PHP5 Common function of xml_set_notation_decl_handler()  The function specifies when the parser is in  XML  The function called when a symbol declaration is found in the document.
　　xml_set_external_entity_ref_handler()  The function specifies when the parser is in  XML  The function called when an external entity is found in the document.
　　xml_set_element_handler()  The function sets up the start and end element handlers.
　　xml_set_default_handler()  Function for  XML  The parser sets up the default data processor.
　　xml_set_character_data_handler()  Function to set up a character data processor.
　　xml_parser_set_option()  Function for  XML  The parser sets the options.
　　xml_parser_get_option()  Function from  XML  The parser gets option setting information.
　　xml_parser_free()  Function to release  XML  The parser.
　　PHP5 Common function of xml_parser_create()  Function creates  XML  The parser.
　　xml_parser_create_ns()  Function creates one with namespace support  XML  The parser.
　　xml_parse_into_struct()  function  XML  The data is parsed into an array.
　　xml_parse()  Function analysis  XML  The document.
　　xml_get_error_code()  Function to obtain  XML  Parser error code.
　　xml_get_current_line_number()  Function to obtain  XML  The parser is the forward sign.
　　xml_get_current_column_number()  Function to obtain  XML  Parsers should be front row.
　　PHP5 Common function of xml_get_current_byte_index()  Function to obtain  XML  The current byte index of the parser.
　　xml_error_string()  Function to obtain  XML  Parser error description.
　　utf8_encode()  function  ISO-8859-1  String encoded as  UTF-8 .
　　utf8_decode()  function  UTF-8  String decoded as  ISO-8859-1 .
　　wordwrap()  The function folds a string for a specified length.
　　vsprintf()  Function writes a formatted string to a variable.
　　vprintf()  The function outputs a formatted string.
　　vfprintf()  The function writes a formatted string to the specified output stream.
　　PHP5 Common function of ucwords()  Function converts the first character of each word in a string to uppercase.
　　ucfirst()  Function converts the first character in a string to uppercase.
　　trim()  Function to remove white space characters and other predefined characters from both ends of a string.
　　substr_replace()  Function to put the string of 1 Part of it is replaced by another 1 A string.
　　substr_count()  The function evaluates the number of occurrences of a substring within a string.
　　substr_compare()  The function compares two strings from the specified starting length.
　　substr()  Function returns a string of 1 Part.
　　strtr()  The function converts a specific character in a string.
　　strtoupper()  The function converts a string to uppercase.
　　strtolower()  Function converts a string to lowercase.
　　PHP5 Common function of strtok()  The function splits a string into smaller strings.
　　strstr()  Search function 1 Two strings in another 1 The first in a string 1 Time.
　　strspn()  The function returns the number of specific characters contained in a string.
　　strrpos()  The function finds the string in another 1 The last in a string 1 Secondary position.
　　strripos()  The function finds the string in another 1 The last in a string 1 Secondary position.
　　strrev()  The function reverses the string.
　　strrchr()  The function finds the string in another 1 The last in a string 1 And returns all characters from that position to the end of the string.
　　strpos()  The function returns a string in another 1 The first in a string 1 Secondary position.
　　PHP5 Common function of strpbrk()  The function searches a string for any of the specified characters 1 A.
　　strncmp()  The function compares two strings.
　　strncasecmp()  The function compares two strings.
　　strnatcmp()  Function USES 1 A "natural" algorithm to compare two strings.
　　strnatcasecmp()  Function USES 1 A "natural" algorithm to compare two strings.
　　strlen()  The function returns the length of a string.
　　stristr()  The function finds the string in another 1 The first in a string 1 Secondary position.
　　stripos()  The function returns a string in another 1 The first in a string 1 Secondary position.
　　stripslashes()  Function deletion by  addslashes()  The backslash added by the function.
　　stripcslashes()  Function deletion by  addcslashes()  The backslash added by the function.
　　strip_tags()  Function strip  HTML , XML  As well as  PHP  The label.
　　strcspn()  The function returns the number of characters looked up in a string before finding any specified character.
　　PHP5 Common function of strcoll()  The function compares two strings.
　　strcmp()  The function compares two strings.
　　strchr()  Search function 1 Two strings in another 1 The first in a string 1 Time.
　　strcasecmp()  The function compares two strings.
　　str_word_count()  The function evaluates the number of words in a string.
　　str_split()  The function splits a string into an array.
　　str_shuffle()  The function randomly scrambles all the characters in a string.
　　str_rot13()  The function executes a string  ROT13  Encoding.
　　str_replace()  Function USES 1 A string replaces another in a string 1 Some of the characters.
　　str_repeat()  The number of times the string is repeated.
　　str_pad()  The file_string () function fills a string with the specified length.
　　str_ireplace()  Function USES 1 A string replaces another in a string 1 Some of the characters.
　　PHP5 Common function of sscanf()  The function parses the source based on the specified format 1 The input of a string.
　　sprintf()  The write () function writes to a formatted string 1 Of the variables.
　　soundex()  The function evaluates a string  soundex  The key.
　　similar_text()  The function evaluates the number of matching characters in two strings.
　　sha1_file()  Function evaluates to a file  SHA-1  Hash.
　　sha1()  The function evaluates a string  SHA-1  Hash.
　　setlocale()  Function to set locale information ( Geographic information ) .
　　PHP5 Common function of rtrim() P rtrim()  function