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8 years ago
These three functions call themselves recursively and handle any nesting levels of arrays/objects/values and do strict comparisons. The entry-point to this function set would be "valuesAreIdentical".

<?php
function valuesAreIdentical($v1, $v2): bool {
    $type1 = gettype($v1);
    $type2 = gettype($v2);

    if($type1 !== $type2){
        return false;
    }

    switch(true){
        case ($type1==='boolean' || $type1==='integer' || $type1==='double' || $type1==='string'):
            //Do strict comparison here.
            if($v1 !== $v2){
                return false;
            }
            break;

        case ($type1==='array'):
            $bool = arraysAreIdentical($v1, $v2);
            if($bool===false){
                return false;
            }
            break;

        case 'object':
            $bool = objectsAreIdentical($v1,$v2);
            if($bool===false){
                return false;
            }
            break;

        case 'NULL':
            //Since both types were of type NULL, consider their "values" equal.
            break;

        case 'resource':
            //How to compare if at all?
            break;

        case 'unknown type':
            //How to compare if at all?
            break;
    } //end switch

    //All tests passed.
    return true;
}

function objectsAreIdentical($o1, $o2): bool {
    //See if loose comparison passes.
    if($o1 != $o2){
        return false;
    }

    //Now do strict(er) comparison.
    $objReflection1 = new ReflectionObject($o1);
    $objReflection2 = new ReflectionObject($o2);

    $arrProperties1 = $objReflection1->getProperties(ReflectionProperty::IS_PUBLIC);
    $arrProperties2 = $objReflection2->getProperties(ReflectionProperty::IS_PUBLIC);

    $bool = arraysAreIdentical($arrProperties1, $arrProperties2);
    if($bool===false){
        return false;
    }

    foreach($arrProperties1 as $key=>$propName){
        $bool = valuesAreIdentical($o1->$propName, $o2->$propName);
        if($bool===false){
            return false;
        }
    }

    //All tests passed.
    return true;
}

function arraysAreIdentical(array $arr1, array $arr2): bool {
    $count = count($arr1);

    //Require that they have the same size.
    if(count($arr2) !== $count){
        return false;
    }

    //Require that they have the same keys.
    $arrKeysInCommon = array_intersect_key($arr1, $arr2);
    if(count($arrKeysInCommon)!== $count){
        return false;
    }

    //Require that their keys be in the same order.
    $arrKeys1 = array_keys($arr1);
    $arrKeys2 = array_keys($arr2);
    foreach($arrKeys1 as $key=>$val){
        if($arrKeys1[$key] !== $arrKeys2[$key]){
            return false;
        }
    }

    //They do have same keys and in same order.
    foreach($arr1 as $key=>$val){
        $bool = valuesAreIdentical($arr1[$key], $arr2[$key]);
        if($bool===false){
            return false;
        }
    }

    //All tests passed.
    return true;
}
?>
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