(PHP 4 >= 4.0.4, PHP 5)
ctype_space — Check for whitespace character(s)
Checks if all of the characters in the provided string, text, creates whitespace.
The tested string.
Returns TRUE if every character in text creates some sort of white space, FALSE otherwise. Besides the blank character this also includes tab, vertical tab, line feed, carriage return and form feed characters.
Example #1 A ctype_space() example 以上例程会输出：
<?php
$strings = array('string1' => "
", 'string2' => "
arf12", 'string3' => '
');
foreach ($strings as $name => $testcase) {
if (ctype_space($testcase)) {
echo "The string '$name' consists of all whitespace characters.
";
} else {
echo "The string '$name' does not consist of all whitespace characters.
";
}
}
?>
The string 'string1' consists of all whitespace characters.
The string 'string2' does not consist of all whitespace characters.
The string 'string3' does not consist of all whitespace characters.
Note:
If an integer between -128 and 255 inclusive is provided, it is interpreted as the ASCII value of a single character (negative values have 256 added in order to allow characters in the Extended ASCII range). Any other integer is interpreted as a string containing the decimal digits of the integer.