ctype_digit
PHP function
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(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)
Check for numeric character(s)
Description
ctype_digit(mixed $text): bool
Checks if all of the characters in the provided string, text, are numerical.
Parameters
textThe tested string. Integer Non-string
Return Values
Returns true if every character in the string text is a decimal digit, false otherwise. Empty-string
Examples
A ctype_digit() example
php
<?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:
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.A ctype_digit() example comparing strings with integers
php
<?php
$numeric_string = '42';
$integer = 42;
ctype_digit($numeric_string); // true
ctype_digit($integer); // false (ASCII 42 is the * character)
is_numeric($numeric_string); // true
is_numeric($integer); // true
?>