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ctype_digit (PHP 4 >= 4.0.4, PHP 5) ctype_digit -- Check for numeric character(s) 说明bool ctype_digit ( string text )
Checks if all of the characters in the provided string,
text, are numerical.
返回值
Returns TRUE if every character in text is
a decimal digit, FALSE otherwise.
例
例子 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";
}
}
?>
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上例将输出： 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. |
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ctype_cntrl