array key casting

array_change_key_type.php

<?php 

function array_change_key_type(array $array, $type = T_STRING_CAST )
{
	if($token === T_STRING_CAST) {
     $obj = new stdClass();
     foreach($array as $key => $value){
        $obj->{$key} = $value;
     }
     return (array) $obj;
    
	} else {
    
     $new_array = [];
     foreach($array as $key => $value){
        $new_array[ cast_by_token($key, $type) ] = $value;
     }
     return $new_array;
  }
}

array_change_key_type_string.php

<?php 

function array_change_key_type_string(array $array)
{
     $obj = new stdClass();
     foreach($array as $key => $value){
        $obj->{$key} = $value;
     }
     return (array) $obj;
}

cast_by_token.php

<?php 
function cast_by_token($variable, $token){

	if($token === T_UNSET_CAST) {
	 return (unset) $variable;
	}
	if($token === T_BOOL_CAST) {
	 return (bool) $variable;
	}
	if($token === T_OBJECT_CAST) {
	 return (object) $variable;
	}
	if($token === T_ARRAY_CAST) {
	 return (array) $variable;
	}
	if($token === T_STRING_CAST) {
	 return (string) $variable;
	}
	if($token === T_DOUBLE_CAST) {
	 return (double) $variable;
	}
	if($token === T_INT_CAST) {
	 return (int) $variable;
	}
	return $variable;
}