PHP string processing function classification (excellent recommendation)

String variables are used for values that contain characters. After creating the string, we can operate on it. You can use the string directly in the function or store it in a variable.

Let’s take a look at the PHP string processing functions:

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##echo Output one or more strings print Output string printf Output formatted string sprintf Return a formatted string fprintf Write the formatted string to the stream sscanf Parse the input characters according to the specified format vfprintf Write the formatted string Incoming stream vprintf Output formatted string vsprintf Return formatted string number_format Format a number with thousand separators money_format Convert the number Formatted as currency string

Print output function	Description

##implode Will a one-dimensional The value of the array is converted into a string join alias implode explode uses one character String splits another string strtok Mark splits string substr Return character Substring of string substr_count Count the number of times a string appears substr_replace Replace characters Substring of string str_split Convert string to array str_getcsv Parse CSV The string is an array str_pad Use another string to fill the string to the specified length str_repeat Repeat a string str_replace Substring replacement str_ireplace The case-ignoring version of str_replace strtr Convert the specified characters str_shuffle Shuffle randomly A string wordwrap Breaks the string into a specified number of words trim Remove blank characters (or other characters) at the beginning and end of the string rtrim Remove blank characters (or other characters) at the end of the string ltrim Remove whitespace characters (or other characters) at the beginning of the string chop alias for rtrim strpos Find the first occurrence of a string stripos Find the first occurrence of a string (Not case sensitive strripos Calculate the position of the last occurrence of the specified string in the target string (not case sensitive) strrpos Calculate the last occurrence of the specified string in the target string) strstr Find the string The first occurrence of stristr The case-ignoring version of the strstr function strrchr Find the specified The last occurrence of the character strchr alias strstr strpbrk in the string Find any character in a set of characters in a string strspn Calculate the first substring in which all characters in the string exist in the specified character set length. strtolower Convert the string to lowercase strtoupper Convert the string to uppercase lcfirst Make the first character of a string lowercase ucfirst Make the character lowercase Convert the first letter of the string to uppercase ucwords Convert the first letter of each word in the string to uppercase strlen Get the string length strrev Reverse the string strip_tags Remove HTML and PHP tags from strings

Commonly used functions	Description

##URL processing function parse_str parse_url http_build_query urldecode urlencode

Description
Parse the string into multiple variables and process the url
Parse the URL and return its components
Generate the request string after URL-encode
Decoding the encoded URL string
Decoding the encoded URL string

htmlRelated functions	Description
addcslashes	In C language Style uses backslashes to escape characters in a string
addslashes	Use backslashes to quote strings
stripcslashes	Dequote a quoted string escaped using addcslashes
stripslashes	Dequote a quoted string
html_entity_decode	Convert HTML entities to their corresponding characters
htmlentities	Convert characters to HTML escaped characters
htmlspecialchars_decode	Convert special HTML entities back to normal characters
htmlspecialchars	Convert special characters to HTML entities
get_html_translation_table	Return the translation table after using htmlspecialchars and htmlentities
nl2br	All in string Insert HTML line break mark before new line

##localeconv Get numeric formatting information 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

Transcoding related functions	Description
bin2hex	Function converts a binary string containing data into a hexadecimal value
chr	Return the specified character
ord	Convert the first byte of the string to a value between 0-255
chunk_split	Split the 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
hebrev	Convert logical order to Hebrew (logical-Hebrew) to visual-Hebrew
hebrevc	Convert logical-Hebrew to logical-Hebrew For visual-Hebrew, and convert newlines
hex2bin	Convert hexadecimal string to binary string
levenshtein	Calculate the edit distance between two strings

Hash related function Description md5_file Calculate the specified file MD5 hash value md5 Calculate the MD5 hash value of the string sha1_file Calculate the sha1 hash value of the file sha1 Calculate the sha1 hash value of the string crypt One-way string hashing crc32 Calculate the crc32 polynomial of a string str_rot13 Perform ROT13 conversion on string

String statistical comparison function	Description
strcspn	Get The length of the starting substring that does not match the mask
str_word_count	Returns the usage of words in the string
substr_compare	Binary safe comparison of strings (specified length compared from offset position)
similar_text	Calculate the similarity of two strings
soundex	Calculate the soundex key of a string
strcasecmp	Binary safe comparison string ( Case insensitive)
strcmp	Binary safe string comparison
strcoll	Zone based Set string comparison
strnatcasecmp	Compares strings using the "natural order" algorithm (case insensitive)
strnatcmp	Compare strings using the natural sorting algorithm
strncasecmp	Binary safe comparison of several characters at the beginning of the string (not case sensitive)
strncmp	Binary safe comparison of several characters at the beginning of a string

Other functions	Description
setlocale	Set regional information
metaphone	Calculate the metaphone key of a string
nl_langinfo	Query language and locale information

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