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.
范例
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
"
;
}
}
?>
|
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.
|
|