ctype_cntrl

PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8
ctype_cntrl - Check for control character(s)
Manual
Code Examples

Example #1 A ctype_cntrl example

Result: The string 'string1' consists of all control characters. The string 'string2' does not consist of all control characters.
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Function ctype_cntrl:

Character type checking Functions

Most used PHP functions