How to determine whether a class method exists in php

In PHP, you can use the "class_exists" function to determine whether a class method exists. The syntax is "bool class_exists (string $class_name [, bool $autoload = true ])".

php determines whether the class exists

bool class_exists ( string $class_name [, bool $autoload = true ] ) Checking whether a class has been defined must return true, otherwise false, for example:

if(class_exists('MySQL')){
    $myclass=new MySQL();
}

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