core/Classes/Utility/ArrayUtility.php

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<?php
namespace TYPO3\CMS\Core\Utility;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

class ArrayUtility
{
    public static function filterByValueRecursive($needle = '', array $haystack = array())
    {
        $resultArray = array();
        // Define a lambda function to be applied to all members of this array dimension
        // Call recursive if current value is of type array
        // Write to $resultArray (by reference!) if types and value match
        $callback = function (&$value, $key) use ($needle, &$resultArray) {
            if ($value === $needle) {
                ($resultArray[$key] = $value);
            } elseif (is_array($value)) {
                ($subArrayMatches = static::filterByValueRecursive($needle, $value));
                if (!empty($subArrayMatches)) {
                    ($resultArray[$key] = $subArrayMatches);
                }
            }
        };
        // array_walk() is not affected by the internal pointers, no need to reset
        array_walk($haystack, $callback);
        // Pointers to result array are reset internally
        return $resultArray;
    }

    public static function isValidPath(array $array, $path, $delimiter = '/')
    {
        $isValid = true;
        try {
            // Use late static binding to enable mocking of this call in unit tests
            static::getValueByPath($array, $path, $delimiter);
        } catch (\RuntimeException $e) {
            $isValid = false;
        }
        return $isValid;
    }

    public static function getValueByPath(array $array, $path, $delimiter = '/')
    {
        if (empty($path)) {
            throw new \RuntimeException('Path must not be empty', 1341397767);
        }
        // Extract parts of the path
        $path = str_getcsv($path, $delimiter);
        // Loop through each part and extract its value
        $value = $array;
        foreach ($path as $segment) {
            if (array_key_exists($segment, $value)) {
                // Replace current value with child
                $value = $value[$segment];
            } else {
                // Fail if key does not exist
                throw new \RuntimeException('Path does not exist in array', 1341397869);
            }
        }
        return $value;
    }

    public static function setValueByPath(array $array, $path, $value, $delimiter = '/')
    {
        if (empty($path)) {
            throw new \RuntimeException('Path must not be empty', 1341406194);
        }
        if (!is_string($path)) {
            throw new \RuntimeException('Path must be a string', 1341406402);
        }
        // Extract parts of the path
        $path = str_getcsv($path, $delimiter);
        // Point to the root of the array
        $pointer = &$array;
        // Find path in given array
        foreach ($path as $segment) {
            // Fail if the part is empty
            if (empty($segment)) {
                throw new \RuntimeException('Invalid path segment specified', 1341406846);
            }
            // Create cell if it doesn't exist
            if (!array_key_exists($segment, $pointer)) {
                $pointer[$segment] = array();
            }
            // Set pointer to new cell
            $pointer = &$pointer[$segment];
        }
        // Set value of target cell
        $pointer = $value;
        return $array;
    }

    public static function removeByPath(array $array, $path, $delimiter = '/')
    {
        if (empty($path)) {
            throw new \RuntimeException('Path must not be empty', 1371757718);
        }
        if (!is_string($path)) {
            throw new \RuntimeException('Path must be a string', 1371757719);
        }
        // Extract parts of the path
        $path = str_getcsv($path, $delimiter);
        $pathDepth = count($path);
        $currentDepth = 0;
        $pointer = &$array;
        // Find path in given array
        foreach ($path as $segment) {
            $currentDepth++;
            // Fail if the part is empty
            if (empty($segment)) {
                throw new \RuntimeException('Invalid path segment specified', 1371757720);
            }
            if (!array_key_exists($segment, $pointer)) {
                throw new \RuntimeException('Path segment ' . $segment . ' does not exist in array', 1371758436);
            }
            if ($currentDepth === $pathDepth) {
                unset($pointer[$segment]);
            } else {
                $pointer = &$pointer[$segment];
            }
        }
        return $array;
    }

    public static function sortByKeyRecursive(array $array)
    {
        ksort($array);
        foreach ($array as $key => $value) {
            if (is_array($value) && !empty($value)) {
                $array[$key] = self::sortByKeyRecursive($value);
            }
        }
        return $array;
    }

    public static function sortArraysByKey(array $arrays, $key, $ascending = true)
    {
        if (empty($arrays)) {
            return $arrays;
        }
        $sortResult = uasort($arrays, function (array $a, array $b) use ($key, $ascending) {
            if (!isset($a[$key]) || !isset($b[$key])) {
                throw new \RuntimeException('The specified sorting key "' . $key . '" is not available in the given array.', 1373727309);
            }
            return ($ascending) ? strcasecmp($a[$key], $b[$key]) : strcasecmp($b[$key], $a[$key]);
        });
        if (!$sortResult) {
            throw new \RuntimeException('The function uasort() failed for unknown reasons.', 1373727329);
        }
        return $arrays;
    }

    public static function arrayExport(array $array = array(), $level = 0)
    {
        $lines = '[' . LF;
        $level++;
        $writeKeyIndex = false;
        $expectedKeyIndex = 0;
        foreach ($array as $key => $value) {
            if ($key === $expectedKeyIndex) {
                $expectedKeyIndex++;
            } else {
                // Found a non integer or non consecutive key, so we can break here
                $writeKeyIndex = true;
                break;
            }
        }
        foreach ($array as $key => $value) {
            // Indention
            $lines .= str_repeat('    ', $level);
            if ($writeKeyIndex) {
                // Numeric / string keys
                $lines .= is_int($key) ? $key . ' => ' : '\'' . $key . '\' => ';
            }
            if (is_array($value)) {
                if (!empty($value)) {
                    $lines .= self::arrayExport($value, $level);
                } else {
                    $lines .= '[],' . LF;
                }
            } elseif (is_int($value) || is_float($value)) {
                $lines .= $value . ',' . LF;
            } elseif (is_null($value)) {
                $lines .= 'null' . ',' . LF;
            } elseif (is_bool($value)) {
                $lines .= $value ? 'true' : 'false';
                $lines .= ',' . LF;
            } elseif (is_string($value)) {
                // Quote \ to \\
                $stringContent = str_replace('\\', '\\\\', $value);
                // Quote ' to \'
                $stringContent = str_replace('\'', '\\\'', $stringContent);
                $lines .= '\'' . $stringContent . '\'' . ',' . LF;
            } else {
                throw new \RuntimeException('Objects are not supported', 1342294987);
            }
        }
        $lines .= str_repeat('    ', ($level - 1)) . ']' . ($level - 1 == 0 ? '' : ',' . LF);
        return $lines;
    }

    public static function flatten(array $array, $prefix = '')
    {
        $flatArray = array();
        foreach ($array as $key => $value) {
            // Ensure there is no trailling dot:
            $key = rtrim($key, '.');
            if (!is_array($value)) {
                $flatArray[$prefix . $key] = $value;
            } else {
                $flatArray = array_merge($flatArray, self::flatten($value, $prefix . $key . '.'));
            }
        }
        return $flatArray;
    }

    public static function intersectRecursive(array $source, array $mask = array())
    {
        $intersection = array();
        foreach ($source as $key => $_) {
            if (!array_key_exists($key, $mask)) {
                continue;
            }
            if (is_array($source[$key]) && is_array($mask[$key])) {
                $value = self::intersectRecursive($source[$key], $mask[$key]);
                if (!empty($value)) {
                    $intersection[$key] = $value;
                }
            } else {
                $intersection[$key] = $source[$key];
            }
        }
        return $intersection;
    }

    public static function renumberKeysToAvoidLeapsIfKeysAreAllNumeric(array $array = array(), $level = 0)
    {
        $level++;
        $allKeysAreNumeric = true;
        foreach ($array as $key => $_) {
            if (is_numeric($key) === false) {
                $allKeysAreNumeric = false;
                break;
            }
        }
        $renumberedArray = $array;
        if ($allKeysAreNumeric === true) {
            $renumberedArray = array_values($array);
        }
        foreach ($renumberedArray as $key => $value) {
            if (is_array($value)) {
                $renumberedArray[$key] = self::renumberKeysToAvoidLeapsIfKeysAreAllNumeric($value, $level);
            }
        }
        return $renumberedArray;
    }


    public static function mergeRecursiveWithOverrule(array &$original, array $overrule, $addKeys = true, $includeEmptyValues = true, $enableUnsetFeature = true)
    {
        foreach ($overrule as $key => $_) {
            if ($enableUnsetFeature && $overrule[$key] === '__UNSET') {
                unset($original[$key]);
                continue;
            }
            if (isset($original[$key]) && is_array($original[$key])) {
                if (is_array($overrule[$key])) {
                    self::mergeRecursiveWithOverrule($original[$key], $overrule[$key], $addKeys, $includeEmptyValues, $enableUnsetFeature);
                }
            } elseif (
                ($addKeys || isset($original[$key])) &&
                ($includeEmptyValues || $overrule[$key])
            ) {
                $original[$key] = $overrule[$key];
            }
        }
        // This line is kept for backward compatibility reasons.
        reset($original);
    }

    public static function inArray(array $in_array, $item)
    {
        foreach ($in_array as $val) {
            if (!is_array($val) && (string)$val === (string)$item) {
                return true;
            }
        }
        return false;
    }

    public static function removeArrayEntryByValue(array $array, $cmpValue)
    {
        foreach ($array as $k => $v) {
            if (is_array($v)) {
                $array[$k] = self::removeArrayEntryByValue($v, $cmpValue);
            } elseif ((string)$v === (string)$cmpValue) {
                unset($array[$k]);
            }
        }
        return $array;
    }

    public static function keepItemsInArray(array $array, $keepItems, $getValueFunc = null)
    {
        if ($array) {
            // Convert strings to arrays:
            if (is_string($keepItems)) {
                $keepItems = GeneralUtility::trimExplode(',', $keepItems);
            }
            // Check if valueFunc can be executed:
            if (!is_callable($getValueFunc)) {
                $getValueFunc = null;
            }
            // Do the filtering:
            if (is_array($keepItems) && !empty($keepItems)) {
                foreach ($array as $key => $value) {
                    // Get the value to compare by using the callback function:
                    $keepValue = isset($getValueFunc) ? call_user_func($getValueFunc, $value) : $value;
                    if (!in_array($keepValue, $keepItems)) {
                        unset($array[$key]);
                    }
                }
            }
        }
        return $array;
    }

    public static function remapArrayKeys(array &$array, array $mappingTable)
    {
        foreach ($mappingTable as $old => $new) {
            if ($new && isset($array[$old])) {
                $array[$new] = $array[$old];
                unset($array[$old]);
            }
        }
    }

    public static function arrayDiffAssocRecursive(array $array1, array $array2)
    {
        $differenceArray = array();
        foreach ($array1 as $key => $value) {
            if (!array_key_exists($key, $array2)) {
                $differenceArray[$key] = $value;
            } elseif (is_array($value)) {
                if (is_array($array2[$key])) {
                    $differenceArray[$key] = self::arrayDiffAssocRecursive($value, $array2[$key]);
                }
            }
        }
        return $differenceArray;
    }

    public static function naturalKeySortRecursive(array &$array)
    {
        uksort($array, 'strnatcasecmp');
        foreach ($array as $key => &$value) {
            if (is_array($value)) {
                self::naturalKeySortRecursive($value);
            }
        }

        return true;
    }
}