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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##echoOutput one or more strings printOutput stringprintfOutput formatted stringsprintfReturn a formatted stringfprintfWrite the formatted string to the streamsscanfParse the input characters according to the specified format vfprintfWrite the formatted string Incoming streamvprintfOutput formatted stringvsprintfReturn formatted string number_formatFormat a number with thousand separatorsmoney_formatConvert the number Formatted as currency string

Print output function	Description

##implodeWill a one-dimensional The value of the array is converted into a string joinalias implodeexplodeuses one character String splits another stringstrtokMark splits stringsubstrReturn character Substring of stringsubstr_countCount the number of times a string appearssubstr_replaceReplace characters Substring of stringstr_splitConvert string to arraystr_getcsvParse CSV The string is an arraystr_padUse another string to fill the string to the specified lengthstr_repeatRepeat a stringstr_replaceSubstring replacementstr_ireplace The case-ignoring version of str_replacestrtrConvert the specified charactersstr_shuffleShuffle randomly A stringwordwrap Breaks the string into a specified number of wordstrimRemove blank characters (or other characters) at the beginning and end of the string rtrimRemove blank characters (or other characters) at the end of the string ltrimRemove whitespace characters (or other characters) at the beginning of the string chopalias for rtrimstrposFind the first occurrence of a stringstriposFind the first occurrence of a string (Not case sensitivestrriposCalculate the position of the last occurrence of the specified string in the target string (not case sensitive)strrposCalculate the last occurrence of the specified string in the target string) strstrFind the string The first occurrence of stristrThe case-ignoring version of the strstr functionstrrchrFind the specified The last occurrence of the character strchralias strstrstrpbrk in the string Find any character in a set of characters in a stringstrspnCalculate the first substring in which all characters in the string exist in the specified character set length. strtolowerConvert the string to lowercasestrtoupperConvert the string to uppercase lcfirstMake the first character of a string lowercase ucfirstMake the character lowercase Convert the first letter of the string to uppercaseucwordsConvert the first letter of each word in the string to uppercasestrlenGet the string lengthstrrevReverse the stringstrip_tagsRemove HTML and PHP tags from strings

Commonly used functions	Description

##URL processing functionparse_strparse_urlhttp_build_queryurldecode 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

##localeconvGet numeric formatting informationquoted_printable_decodeConvert quoted-printable string to 8-bit stringquoted_printable_encode Convert 8-bit string to quoted-printable stringquotemetaEscape 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 functionDescriptionmd5_fileCalculate the specified file MD5 hash valuemd5 Calculate the MD5 hash value of the stringsha1_fileCalculate the sha1 hash value of the filesha1Calculate the sha1 hash value of the stringcryptOne-way string hashingcrc32Calculate the crc32 polynomial of a stringstr_rot13Perform 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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