main/lib/type/collection.php

См. документацию.

<?php
namespace Bitrix\Main\Type;
 
class Collection
{
    /**
     * Sorting array by column.
     * You can use short mode: Collection::sortByColumn($arr, 'value'); This is equal Collection::sortByColumn($arr, array('value' => SORT_ASC))
     *
     * Pay attention: if two members compare as equal, their relative order in the sorted array is undefined. The sorting is not stable.
     *
     * More example:
     * Collection::sortByColumn($arr, array('value' => array(SORT_NUMERIC, SORT_ASC), 'attr' => SORT_DESC), array('attr' => 'strlen'), 'www');
     *
     * @param array        $array
     * @param string|array $columns
     * @param string|array $callbacks
     * @param null         $defaultValueIfNotSetValue If value not set - use $defaultValueIfNotSetValue (any cols)
     * @param bool         $preserveKeys If false numeric keys will be re-indexed. If true - preserve.
     * @throws \Bitrix\Main\ArgumentOutOfRangeException
     */
    public static function sortByColumn(array &$array, $columns, $callbacks = '', $defaultValueIfNotSetValue = null, $preserveKeys = false)
    {
        //by default: sort by ASC
        if (!is_array($columns))
        {
            $columns = array($columns => SORT_ASC);
        }
        $params = $preserveDataKeys = array();
        $alreadyFillPreserveDataKeys = false;
        foreach ($columns as $column => &$order)
        {
            $callback = null;
            //this is an array of callbacks (callable string)
            if(is_array($callbacks) && !is_callable($callbacks))
            {
                //if callback set for column
                if(!empty($callbacks[$column]))
                {
                    $callback = is_callable($callbacks[$column])? $callbacks[$column] : false;
                }
            }
            //common callback
            elseif(!empty($callbacks))
            {
                $callback = is_callable($callbacks)? $callbacks : false;
            }
 
            if($callback === false)
            {
                throw new \Bitrix\Main\ArgumentOutOfRangeException('callbacks');
            }
 
            //this is similar to the index|slice
            $valueColumn[$column] = array();
            foreach ($array as $index => $row)
            {
                $value = isset($row[$column]) ? $row[$column] : $defaultValueIfNotSetValue;
                if ($callback)
                {
                    $value = call_user_func_array($callback, array($value));
                }
                $valueColumn[$column][$index] = $value;
                if($preserveKeys && !$alreadyFillPreserveDataKeys)
                {
                    $preserveDataKeys[$index] = $index;
                }
            }
            unset($row, $index);
            $alreadyFillPreserveDataKeys = $preserveKeys && !empty($preserveDataKeys);
            //bug in 5.3 call_user_func_array
            $params[] = &$valueColumn[$column];
            $order    = (array)$order;
            foreach ($order as $i => $ord)
            {
                $params[] = &$columns[$column][$i];
            }
        }
        unset($order, $column);
        $params[] = &$array;
        if($preserveKeys)
        {
            $params[] = &$preserveDataKeys;
        }
 
        call_user_func_array('array_multisort', $params);
 
        if($preserveKeys)
        {
            $array = array_combine(array_values($preserveDataKeys), array_values($array));
        }
    }
 
    /**
     * Takes all arguments by pairs..
     * Odd arguments are arrays.
     * Even arguments are keys to lookup in these arrays.
     * Keys may be arrays. In this case function will try to dig deeper.
     * Returns first not empty element of a[k] pair.
     *
     * @param array $a array to analyze
     * @param string|int $k key to lookup
     * @param mixed $a,... unlimited array/key pairs to go through
     * @return mixed|string
     */
    public static function firstNotEmpty()
    {
        $argCount = func_num_args();
        for ($i = 0; $i < $argCount; $i += 2)
        {
            $anArray = func_get_arg($i);
            $key = func_get_arg($i+1);
            if (is_array($key))
            {
                $current = &$anArray;
                $found = true;
                foreach ($key as $k)
                {
                    if (!is_array($current) || !array_key_exists($k, $current))
                    {
                        $found = false;
                        break;
                    }
                    $current = &$current[$k];
                }
                if ($found)
                {
                    if (is_array($current) || is_object($current) || $current != "")
                        return $current;
                }
            }
            elseif (is_array($anArray) && array_key_exists($key, $anArray))
            {
                if (is_array($anArray[$key]) || is_object($anArray[$key]) || $anArray[$key] != "")
                    return $anArray[$key];
            }
        }
        return "";
    }
 
    /**
     * Convert array values to int, return unique values > 0. Optionally sorted array.
     *
     * @param array &$map   Array for normalize.
     * @param bool $sorted  If sorted true, result array will be sorted.
     * @return void
     */
    public static function normalizeArrayValuesByInt(&$map, $sorted = true)
    {
        if (empty($map) || !is_array($map))
            return;
 
        $result = array();
        foreach ($map as $value)
        {
            $value = (int)$value;
            if (0 < $value)
                $result[$value] = true;
        }
        $map = array();
        if (!empty($result))
        {
            $map = array_keys($result);
            if ($sorted)
                sort($map);
        }
    }
 
    /**
     * Check array is associative.
     *
     * @param $array - Array for check.
     * @return bool
     */
    public static function isAssociative(array $array)
    {
        $array = array_keys($array);
 
        return ($array !== array_keys($array));
    }
}