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ctype
PHP Manual

ctype_graph

(PHP 4 >= 4.0.4, PHP 5)

ctype_graph — Check for any printable character(s) except space

说明

bool ctype_graph ( string $text )

Checks if all of the characters in the provided string, text , creates visible output.

参数

text

The tested string.

返回值

Returns TRUE if every character in text is printable and actually creates visible output (no white space), FALSE otherwise.

范例

Example#1 A ctype_graph() example

<?php
$strings = array('string1' => "asdf\n\r\t", 'string2' => 'arf12', 'string3' => 'LKA#@%.54');
foreach ($strings as $name => $testcase) {
    if (ctype_graph($testcase)) {
        echo "The string '$name' consists of all (visibly) printable characters.\n";
    } else {
        echo "The string '$name' does not consist of all (visibly) printable characters.\n";
    }
}
?>

上例将输出：

The string 'string1' does not consist of all (visibly) printable characters.
The string 'string2' consists of all (visibly) printable characters.
The string 'string3' consists of all (visibly) printable characters.

参见

ctype
PHP Manual