(PHP 4 >= 4.0.4, PHP 5, PHP 7)
ctype_digit — Check for numeric character(s)
ctype_digit ( mixed $text ) : bool
Checks if all of the characters in the provided string, text, are numerical.
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.
Returns true if every character in the string text is a decimal digit, false otherwise.
Example #1 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.
Example #2 A ctype_digit() example comparing strings with integers
<?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 ?>
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https://www.php.net/manual/en/function.ctype-digit.php