The IntlChar::iscntrl() function is an inbuilt function in PHP which is used to check the given input is a control character or not. Control characters are line feed, tab, escape, etc.
A control character is one of the following types:
- ISO 8-bit control character (U+0000..U+001f and U+007f..U+009f)
- IntlChar::CHAR_CATEGORY_CONTROL_CHAR (Cc)
- IntlChar::CHAR_CATEGORY_FORMAT_CHAR (Cf)
- IntlChar::CHAR_CATEGORY_LINE_SEPARATOR (Zl)
- IntlChar::CHAR_CATEGORY_PARAGRAPH_SEPARATOR (Zp)
Syntax:
bool IntlChar::iscntrl( $codepoint )
Parameters: This function accepts single parameter $codepoint which is mandatory. The codepoint value is an integer values or character, which is encoded as a UTF-8 string.
Return Value: If $codepoint is a control character then it returns True, otherwise return False.
Below programs illustrate the IntlChar::iscntrl() function in PHP:
Program 1:
PHP
<?php// PHP code to illustrate IntlChar::iscntrl()// function // Input data is character typevar_dump(IntlChar::iscntrl("G"));// Input data is control charactervar_dump(IntlChar::iscntrl("\n")); // Input data is string type with control charactervar_dump(IntlChar::iscntrl("G\n")); // Input data is string type with no control charactervar_dump(IntlChar::iscntrl("Geeksforneveropen")); // Input data is numbervar_dump(IntlChar::iscntrl("2018")); // Input data is single digitvar_dump(IntlChar::iscntrl("5"));?> |
Output:
bool(false) bool(true) NULL NULL NULL bool(false)
Note: If String and Numbers are used as a parameter then it returns NULL.
Program 2:
PHP
<?php// PHP code to illustrate IntlChar::iscntrl() // Declare an array $arr$arr = array("G", "neveropen", "^", "1001", "6", "\n", "\n\n", "\t"); // Loop run for every array elementforeach ($arr as $val){ // Check each element as code point data var_dump(IntlChar::iscntrl($val));}?> |
Output:
bool(false) NULL bool(false) NULL bool(false) bool(true) NULL bool(true)
Related Articles:
- PHP | IntlChar::isalpha() Function
- PHP | IntlChar::isdigit() Function
- PHP | IntlChar::isblank() Function
- PHP | IntlChar::isbase() Function
Reference: http://php.net/manual/en/intlchar.iscntrl.php
