What are the string methods in php

String methods include: ltrim() that removes blank characters or other characters on the left side of the string, count_chars() that returns the character information used in the string, echo() that outputs one or more strings, explode() that breaks up strings into arrays, hex2bin() that converts hexadecimal values ​​into ASCII characters, html_entity_decode() that converts HTML entities into characters, htmlentities() that converts characters into HTML entities, etc. .

The operating environment of this tutorial: windows7 system, PHP8 version, DELL G3 computer

php string method (function)

The String function in PHP is a core component of PHP. No installation is required to use these functions.

• addcslashes(): Returns a string with a backslash added before the specified character.

• addslashes(): Returns a string with backslashes added before predefined characters.

• bin2hex(): Convert a string of ASCII characters to a hexadecimal value.

• chop(): Remove blank characters or other characters on the right side of the string.

• chr(): Returns characters from the specified ASCII value.

• chunk_split(): Split the string into a series of smaller parts.

• convert_cyr_string(): Convert a string from one Cyrillic character set to another.

• convert_uudecode(): Decode uuencode-encoded string.

• convert_uuencode(): Use the uuencode algorithm to encode a string.

• count_chars(): Returns information about the characters used in the string.

• crc32(): Calculate the 32-bit CRC (cyclic redundancy check) of a string.

• crypt(): One-way string encryption (hashing).

• echo(): Output one or more strings.

• explode(): Break up the string into an array.

• fprintf(): Write the formatted string to the specified output stream.

• get_html_translation_table(): Returns the translation table used by htmlspecialchars() and htmlentities().

• hebrev(): Convert Hebrew text to visible text.

• hebrevc(): Convert Hebrew text to visible text and convert new lines (\n) to
  .

• hex2bin(): Convert a string of hexadecimal values ​​to ASCII characters.

• html_entity_decode(): Convert HTML entities to characters.

• htmlentities(): Convert characters into HTML entities.

• htmlspecialchars_decode(): Convert some predefined HTML entities into characters.

• htmlspecialchars(): Convert some predefined characters into HTML entities.

• implode(): Returns a string composed of array elements.

• join(): Alias ​​of implode().

• lcfirst(): Convert the first character in the string to lowercase.

• levenshtein(): Returns the Levenshtein distance between two strings.

• localeconv(): Returns local number and currency format information.

• ltrim(): Remove whitespace characters or other characters on the left side of the string.

• md5(): Computes the MD5 hash of a string.

• md5_file(): Calculate the MD5 hash of the file.

• metaphone(): Calculates the metaphone key of a string.

• money_format(): Returns a string formatted as a currency string.

• nl_langinfo(): Returns the specified local information.

• nl2br(): Inserts an HTML newline character before each new line in the string.

• number_format(): Format numbers by thousands grouping.

• ord(): Returns the ASCII value of the first character in the string.

• parse_str(): Parse the query string into variables.

• print(): Output one or more strings.

• printf(): Outputs a formatted string.

• quoted_printable_decode(): Convert quoted-printable string to 8-bit string.

• quoted_printable_encode(): Convert an 8-bit string to a quoted-printable string.

• quotemeta(): Quote metacharacter.

• rtrim(): Remove whitespace characters or other characters on the right side of the string.

• setlocale(): Set regional information (regional information).

• sha1(): Computes the SHA-1 hash of a string.

• sha1_file(): Computes the SHA-1 hash of a file.

• similar_text(): Calculate the similarity of two strings.

• soundex(): Calculates the soundex key of a string.

• sprintf(): Write the formatted string into a variable.

• sscanf(): Parses input from a string according to the specified format.

• str_getcsv(): Parse the CSV string into an array.

• str_ireplace(): Replace some characters in the string (case insensitive).

• str_pad(): Pad the string to the new length.

• str_repeat(): Repeat the string a specified number of times.

• str_replace(): Replace some characters in the string (case sensitive).

• str_rot13(): Performs ROT13 encoding on a string.

• str_shuffle(): Randomly shuffle all characters in the string.

• str_split(): Split the string into an array.

• str_word_count(): Count the number of words in a string.

• strcasecmp(): Compares two strings (case insensitive).

• strchr(): Find the first occurrence of a string in another string. (Alias ​​for strstr().)

• strcmp(): Compares two strings (case sensitive).

• strcoll(): Compares two strings (according to local settings).

• strcspn(): Returns the number of characters searched in the string before any specified character is found.

• strip_tags(): Strips HTML and PHP tags from a string.

• stripcslashes(): Removes backslashes added by the addcslashes() function.

• stripslashes(): Removes backslashes added by addslashes() function.

• stripos(): Returns the position of the first occurrence of a string in another string (case insensitive).

• stristr(): Find the first occurrence of a string in another string (case insensitive).

• strlen(): Returns the length of the string. Chinese string processing uses the mb_strlen() function.

• strnatcasecmp(): Uses a "natural ordering" algorithm to compare two strings (case insensitive).

• strnatcmp(): Uses a "natural ordering" algorithm to compare two strings (case sensitive).

• strncasecmp(): String comparison of the first n characters (case insensitive).

• strncmp(): String comparison of the first n characters (case sensitive).

• strpbrk(): Search for any one of the specified characters in the string.

• strpos(): Returns the position of the first occurrence of a string in another string (case sensitive).

• strrchr(): Find the last occurrence of a string in another string.

• strrev(): Reverse a string.

• strripos(): Find the last occurrence of a string in another string (case insensitive).

• strrpos(): Find the last occurrence of a string in another string (case sensitive).

• strspn(): Returns the number of specific characters contained in a string.

• strstr(): Find the first occurrence of a string in another string (case sensitive).

• strtok(): Split the string into smaller strings.

• strtolower(): Convert the string to lowercase letters.

• strtoupper(): Convert the string to uppercase letters.

• strtr(): Convert specific characters in the string.

• substr(): Returns a part of the string.

• mb_substr(): Returns a part of the Chinese string.

• substr_compare(): Compares two strings starting at a specified starting position (binary safe and optionally case-sensitive).

• substr_count(): Count the number of times a substring appears in a string.

• substr_replace(): Replace part of a string with another string.

• trim(): Remove whitespace characters and other characters on both sides of the string.

• ucfirst(): Convert the first character in the string to uppercase.

• ucwords(): Convert the first character of each word in the string to uppercase.

• vfprintf(): Write the formatted string to the specified output stream.

• vprintf(): Outputs a formatted string.

• vsprintf(): Write the formatted string into the variable.

• wordwrap(): Wrap the string according to the specified length.

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