php method_exists detects whether a class includes a function_PHP tutorial

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php tutorial method_exists detects whether a class includes a function

The syntax of the method_exists() function is as follows: bool method_exists (object object, string method_name)

The method_exists() function is used to check whether the method of the class exists.

Returns true if the method pointed to by method_name is defined in the object class pointed to by object, otherwise returns false

class a {
Public function xx(){
echo 'xx';
}
 
Public function yy() {
echo 'yy';
}
}

$obj = new a();

var_dump(method_exists($obj, 'xx'));
var_dump(method_exists($obj, 'xx'));
var_dump(method_exists($obj, 'xx'));

The test results are all true

class a {
Public function xx(){
echo 'xx';
}
 
Public function yy() {
echo 'yy';
}

public function yy() {
echo 'yy';
}
}

$obj = new a();
$obj->yy();
$obj->yy();

The above statement reports an error.
I just discovered today that the object attributes of PHP are not case-sensitive