PHP ctype_digit() Function Usage and Example

PHP Ctype Function Manual

The ctype_digit() function checks whether all characters in the string are numbers.

Syntax

ctype_digit(\$text);

Definition and Usage

It checks whether all characters in the provided string are numbers. It only checks1 ... 9

Parameter

Return value

If each character in the text is a decimal digit, it returns TRUE, otherwise it returns FALSE.

Online Example

<?php
　　　\$strings = array('122.50',1004', foo!#$bar');
　　　
　　　foreach (\$strings as \$test) {
　　　　　　if (ctype_digit(\$test)) {
　　　　　　　　　echo "\$test all characters are numbers\n";
　　　　　　}else {
　　　　　　　　　echo "\$test contains non-numeric characters\n";
　　　　　　}
　　　}
?>

Output result:

122.50 contains non-numeric characters
1004　All characters are numbers　
foo!#$bar contains non-numeric characters

　 PHP Ctype Function Manual