程式設計@筆記

Example #1
<?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";
}
}
?>
以上例程会输出：

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
<?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
?>