PHP: is_bool() function
The is_bool() function is used to find whether a variable is an a boolean or not.
(PHP 4 and above)
|var_name||The variable being checked.||Required||Mixed*|
*Mixed: Mixed indicates that a parameter may accept multiple (but not necessarily all) types.
TRUE if var_name is a boolean, FALSE otherwise.
Value Type: Boolean.
<?php $var_name=false; if (is_bool($var_name)) echo 'This is a boolean.'; else echo 'This is not a boolean.'; ?>
This is a boolean.
PHP: Tips of the Day
PHP - how to create a newline character?
Only double quoted strings interpret the escape sequences \r and \n as '0x0D' and '0x0A' respectively, so you want:
Single quoted strings, on the other hand, only know the escape sequences \\ and \'.
So unless you concatenate the single quoted string with a line break generated elsewhere (e. g., using double quoted string "\r\n" or using chr function chr(0x0D).chr(0x0A)), the only other way to have a line break within a single quoted string is to literally type it with your editor:
$s = 'some text before the line break some text after';
Make sure to check your editor for its line break settings if you require some specific character sequence (\r\n for example).
Ref : https://bit.ly/3hcyege
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