An idea about defining methods in PHP

The general format when defining methods in php is function foo( arg1, $arg1,$arg2. . )
Written in the format
function foo(arg1=fal se, sscccarg2. if($arg1 == true){
Execution condition 1
}
}

When the first $arg1 = false, it means when arg1 has no passed value,

The second one

arg1 ==truewhen, refers to iswhen( $arg1 = false,$arg1 = false) is true Personally, this is an idea of ​​how to write

$arg1 == true时，指的是当（$ The above introduces an idea of ​​defining methods in PHP, including aspects. I hope it will be helpful to friends who are interested in PHP tutorials.