Question

How to check if a string contains only digits in PHP

Answer 1

$pattern = '/.*[^0-9].*/';

$s = "3762724";
echo (!preg_match($pattern, $s)) ? "yes\n" : "no\n";

$s = "3762724W";
echo (!preg_match($pattern, $s)) ? "yes\n" : "no\n";

$pattern = '/.*\D.*/';

$s = "83947592384";
echo (!preg_match($pattern, $s)) ? "yes\n" : "no\n";

$s = "930239WP";
echo (!preg_match($pattern, $s)) ? "yes\n" : "no\n";




/*
run:

yes
no
yes
no

*/

 

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Answer 2

<?php

$str = "3762724";
$b = ctype_digit($str);
echo $b ? 'true' : 'false';

echo "\n";

$str = "3762724W";
$b = ctype_digit($str);
echo $b ? 'true' : 'false';




/*
run:

true
false

*/

 

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