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PHP ctype (Character type) Functions
PHP provides some of the built-in functions, which are used to verify the characters in the string i.e. to check whether a string contains the characters of specific types.
Table of Contents
Here, is the list of the PHP ctype functions -
| Functions | Descriptions |
|---|
| ctype_alnum() | Checks whether given string contains all alphabets or numbers |
| ctype_alpha() | Checks whether given string contains all alphabets |
| ctype_digit() | Checks whether given string contains all digits |
| ctype_space() | Checks whether given string contains spaces (whitespaces, tab, new line etc) |
| ctype_lower() | Checks whether given string contains all lowercase characters |
| ctype_upper() | Checks whether given string contains all uppercase characters |
| ctype_punct() | Checks whether given string contains all punctuation characters |
| ctype_xdigit() | Checks whether given string contains all hexadecimal digits |
| ctype_print() | Checks whether given string contains all printable characters |
| ctype_graph() | Checks whether given string contains all printable characters expect space |
| ctype_cntrl() | Checks whether given string contains all control characters |
Example
In this PHP example, we are using some of the characters type functions.
<?php
echo (ctype_alnum("Hello123")."\n");
echo (ctype_alpha("Helloworld")."\n");
echo (ctype_digit("01234")."\n");
echo (ctype_space("\r\n \t")."\n");
echo (ctype_lower("helloworld")."\n");
echo (ctype_upper("HELLOWORLD")."\n");
echo (ctype_punct("!@#~*&(){}")."\n");
echo (ctype_xdigit("aaff01290")."\n");
echo (ctype_print("Hello world!")."\n");
echo (ctype_graph("Hello123!@#")."\n");
echo (ctype_cntrl("\x00\x1F\x7F\r\n")."\n");
?>
Output
1
1
1
1
1
1
1
1
1
1
1