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PHP : Function Reference : Character Type Functions : ctype_cntrl

ctype_cntrl

Check for control character(s) (PHP 4 >= 4.0.4, PHP 5)
bool ctype_cntrl ( string text )

Checks if all of the characters in the provided string, text, are control characters. Control characters are e.g. line feed, tab, escape.

Parameters

text: The tested string.

Return Values

Returns TRUE if every character in text is a control character from the current locale, FALSE otherwise.

Examples

Example 418. A ctype_cntrl() example

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<?php

$strings = array('string1' => "\n\r\t", 'string2' => 'arf12');

foreach ($strings as $name => $testcase) {

    if (ctype_cntrl($testcase)) {

        echo "The string '$name' consists of all control characters.\n";

    } else {

        echo "The string '$name' does not consist of all control characters.\n";

    }

}
?>

The above example will output:

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The string 'string1' consists of all control characters.

The string 'string2' does not consist of all control characters.

See Also

ctype_print()

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ctype_alnum
ctype_alpha
ctype_cntrl
ctype_digit
ctype_graph
ctype_lower
ctype_print
ctype_punct
ctype_space
ctype_upper
ctype_xdigit

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