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ctype_cntrl()

« ctype_alpha | ctype_digit »
<?php
$bool 
ctype_cntrl (
    
  // string $text
);
?>
Result
$bool = true
Examples
#1 ctype_cntrl  ("\n\r\t")
#2 ctype_cntrl  ("arf12")
See also
ctype_print