Several Forgotten PHP String Processing Functions

Using PHP string processing functions can greatly reduce the burden of programming. Here are some forgotten but very powerful PHP string processing functions in the PHP language. This article will not give individual examples. Everyone is interested. If so, you can test it yourself.

(PHP 4 >= 4.0.4, PHP 5)

Function prototype bool ctype_alnum (string text)
ctype_alnum -- Check for alphanumeric character(s)
Detection Whether it only contains [A-Za-z0-9]

Function prototype bool ctype_alpha (string text)
ctype_alpha -- Check for alphabetic character(s)
Detect whether it only contains [A -Za-z]

ctype_cntrl -- Check for control character(s)
Check whether it only contains character control characters whose class is "\r\b\t"

ctype_digit -- Check for numeric character(s)
When checking, it is a string containing only numeric characters (0-9)

ctype_graph -- Check for any printable character(s) except space
Check whether it is a string containing only printable characters (except spaces)

ctype_lower -- Check for lowercase character(s)
Check whether all characters are English letters, and all It is lowercase

ctype_print -- Check for printable character(s)
Check whether it is a string containing only characters that can be printed

ctype_punct -- Check for any printable character which is not whitespace or an alphanumeric character
Check whether it is a printable character that only contains non-digits/characters/spaces

ctype_space -- Check for whitespace character(s)
Check whether it is Only contains characters such as "\r\b\t" and spaces

ctype_upper -- Check for uppercase character(s)
Check whether all characters are English letters and are Uppercase

ctype_xdigit -- Check for character(s) representing a hexadecimal digit
Check whether it is a hexadecimal string, which can only include "0123456789abcdef"

The above are just a few Some forgotten but very powerful PHP string processing functions in the PHP language. I hope they will be helpful to everyone.

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Summary of Perl’s commonly used string processing functions

Detailed explanation of PHP’s built-in string processing functions

Commonly used string processing functions in php

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