当我在条件中使用true时，strpos函数无法正常工作？

When i am using this code it show me correct result

    <?php
        $string = 'there is some text';
        $find = 'some';
        function iscontain($string,$find){
           $check = strpos($string, $find);
           if ($check === false) { return 0; }else{ return 1; }
        }

        if(iscontain($string,$find)){ 
            echo "true"; 
        }else{
            echo "false"; 
             }

     //output:  true

?>

But when i change false into true and also change return values like if check is true so return 1 else 0 so logically is correct but result not showing correct

    <?php
    $string = 'there is some text';
    $find = 'some';
    function iscontain($string,$find){
       $check = strpos($string, $find);
       if ($check === true) { return 1; }else{ return 0; }
    }

    if(iscontain($string,$find)){ 
        echo "true"; 
    }else{
        echo "false"; 
    }

 //output : false

?>

Why both results are different ..? Thanks.

This happens because strpos never returns true.

It can return false or integer number.

So in your second function else branch always run returning 0 which is considered falsy.