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emeka at echeruo at gmail dot com ¶
9 years ago
Resubmitting... the update for takes into account comparison issues  

Computes the difference of all the arrays

<?php

/**
 * array_diffs — Computes the difference of all the arrays 
 * 
 * @param array 
 * 
 *    array1 - The array to compare from and against
 *    array2 - The array to compare from and against
 *    array(n) - More arrays to compare from and against
 *        
 * @return array Returns all the arrays that do contains entries that cannot be matched in any of the arrays.  
 */
 
function array_diffs() {
    $count = func_num_args();
    if($count < 2) {
        trigger_error('Must provide at least 2 arrays for comparison.');
    }
    $check = array();
    $out = array();
     //resolve comparison issues in PHP
    $func = function($a, $b) {
        if(gettype($a) == 'integer' && gettype($b['value']) == 'double' || gettype($a) == 'double' && gettype($b['value']) == 'integer') {
            if(gettype($a) == 'integer') {
                if((double) $a == $b['value']) {
                    return true;
                }
            } else {
                if((double) $b['value'] == $a) {
                    return true;
                }
            }
        } elseif(gettype($a) == 'double' && gettype($b['value']) == 'double') {
            $epsilon = 0.00001;
            if(abs($a - $b['value']) < $epsilon) {
                return true;
            }
        } else {
            if($a == $b['value']) {
                return true;
            }
        }
        return false;
    };
    for ($i = 0; $i < $count; $i++) {
        if(!is_array(func_get_arg($i))) {
            trigger_error('Parameters must be passed as arrays.');
        }
        foreach(func_get_arg($i) as $key => $value) {
            if(is_numeric($key) && is_string($value)) {
                if(array_key_exists($value, $check) && $func($value, $check[$value])) {
                    $check[$value]['count'] = $check[$value]['count'] + 1;
                } else {
                    $check[$value]['value'] = $value;
                    $check[$value]['count'] = 1;
                }
            } elseif(is_numeric($key) && (is_bool($value) || is_null($value) || is_numeric($value) || is_object($value) || is_resource($value))) {
                $update = false;
                foreach($check as $check_key => $check_value) {
                    if(is_numeric($key) && (is_bool($check_value['value']) || is_null($check_value['value']) || is_numeric($check_value['value']) || is_object($check_value['value']) || is_resource($check_value['value']))) {
                        if($func($value, $check_value)) {
                            $update = true;
                            $check[$check_key]['count'] = $check[$check_key]['count'] + 1;
                        }
                    } 
                }
                if(!$update) {
                    $check[] = array('value' => $value, 'count' => 1);
                }
            } else {
                if(array_key_exists($key, $check) && $func($value, $check[$key])) {
                    $check[$key]['count'] = $check[$key]['count'] + 1;
                } else {
                    $check[$key]['value'] = $value;
                    $check[$key]['count'] = 1;
                }
            }
        }
    }
    foreach($check as $check_key => $check_value) {
        if($check_value['count'] == 1) {
            for ($i = 0; $i < $count; $i++) {
                foreach(func_get_arg($i) as $key => $value) {
                    if(is_numeric($key) && is_string($value)) {
                        if($value == (string) $check_key) {
                            $out[$i][$key] = $value;
                        }
                    } elseif(is_numeric($key) && (is_bool($value) || is_null($value) || is_numeric($value) || is_object($value) || is_resource($value))) { 
                        if(is_numeric($key) && (is_bool($check_value['value']) || is_null($check_value['value']) || is_numeric($check_value['value']) || is_object($check_value['value']) || is_resource($check_value['value']))) {
                            if($check_value['value'] == $value) {
                                $out[$i][$key] = $value;
                            }
                        }
                    } else {
                        if($key == $check_key) {
                            $out[$i][$key] = $value;
                        }
                    }
                }
            }
        }
    }
    return $out;
}

?>
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