ctype_cntrl
(PHP 4 >= 4.0.4, PHP 5)
ctype_cntrl — Check for control character(s)
Description
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 #1 A ctype_cntrl() example
<?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:
The string 'string1' consists of all control characters. The string 'string2' does not consist of all control characters.
Notes
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.
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