ctype_digit是PHP的函式，主要功能是檢測字元串中的字元是否都是數字，負數和小數會檢測不通過。 注意，參數一定要是字元串，如果不是字元串，則會返回0/FASLE。
基本介紹
- 外文名：ctype_digit
- 說明：boolctype_digit( string text )
- 參數：text The tested string.
- 類型：函式
ctype_digit,說明,參數,返回值,範例,
ctype_digit
(PHP 4 >= 4.0.4, PHP 5)
ctype_digit -- Check for numeric character(s)
說明
bool ctype_digit ( string text )
Checks if all of the characters in the provided string, text, are numerical.
參數
text The tested string.
返回值
Returns TRUE if every character in text is a decimal digit, FALSE otherwise.
範例
ctype_digit()
<?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";
}
}
?> 上例將輸出：
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.
