ctype_alpha
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
ctype_alpha — Check for alphabetic character(s)
Description
ctype_alpha ( mixed $text ) : bool
Checks if all of the characters in the provided string, text, are alphabetic. In the standard C locale letters are just [A-Za-z] and ctype_alpha() is equivalent to (ctype_upper($text) || ctype_lower($text)) if $text is just a single character, but other languages have letters that are considered neither upper nor lower case.
Parameters
-
text -
The tested string.
Note:
If an int between -128 and 255 inclusive is provided, it is interpreted as the ASCII value of a single character (negative values have 256 added in order to allow characters in the Extended ASCII range). Any other integer is interpreted as a string containing the decimal digits of the integer.
Return Values
Returns true if every character in text is a letter from the current locale, false otherwise.
Examples
Example #1 A ctype_alpha() example (using the default locale)
<?php
$strings = array('KjgWZC', 'arf12');
foreach ($strings as $testcase) {
if (ctype_alpha($testcase)) {
echo "The string $testcase consists of all letters.\n";
} else {
echo "The string $testcase does not consist of all letters.\n";
}
}
?> The above example will output:
The string KjgWZC consists of all letters. The string arf12 does not consist of all letters.
See Also
- ctype_upper() - Check for uppercase character(s)
- ctype_lower() - Check for lowercase character(s)
- setlocale() - Set locale information
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Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.ctype-alpha.php