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# ctype_digit

(PHP 4 >= 4.0.4, PHP 5)

ctype_digit -- Check for numeric character(s)

## Description

bool ctype_digit ( string text)

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

示範 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"; } } ?>`
This example will output :
    The string 1820.20 does not consists of all digits.
    The string 10002 consists of all digits.
    The string wsl!12 does not consists of all digits.

See also ctype_alnum() and ctype_xdigit().

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