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ctype_digit

Check for numeric character(s) (PHP 4 >= 4.0.4, PHP 5)
bool ctype_digit ( string text )

Checks if all of the characters in the provided string, text, are numerical.

Parameters

text

The tested string.

Return Values

Returns TRUE if every character in text is a decimal digit, FALSE otherwise.

Examples

Example 419. A ctype_digit() example

<?php
$strings
= array('1820.20', '10002', 'wsl!12');
foreach (
$strings as $testcase) {
   if (
ctype_digit($testcase)) {
       echo
"The string $testcase consists of all digits.\n";
   } else {
       echo
"The string $testcase does not consist of all digits.\n";
   }
}
?>

The above example will output:

The string 1820.20 does not consist of all digits.
The string 10002 consists of all digits.
The string wsl!12 does not consist of all digits.