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<?php

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namespace Smush\Core;

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class Array_Utils {

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public function array_hash( $array, $keys = array() ) {

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$hash = 0;

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if ( is_array( $array ) ) {

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foreach ( $array as $key => $value ) {

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if ( is_array( $value ) ) {

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$value_hash = $this->array_hash(

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$value,

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array_merge( $keys, array( $key ) )

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);

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} else {

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$prefix = join( '~', $keys );

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$value_hash = crc32( $prefix . $value );

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}

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$hash += $value_hash;

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}

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}

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return $hash;

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}

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public function get_array_value( $haystack, $key, $default_value = null ) {

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if ( ! is_array( $key ) ) {

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$key = array( $key );

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}

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if ( ! is_array( $haystack ) ) {

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return $default_value;

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}

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$value = $haystack;

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foreach ( $key as $key_part ) {

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$value = isset( $value[ $key_part ] ) ? $value[ $key_part ] : $default_value;

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}

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return $value;

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}

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public function put_array_value( &$haystack, $value, $keys ) {

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if ( ! is_array( $keys ) ) {

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$keys = array( $keys );

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}

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$pointer = &$haystack;

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foreach ( $keys as $key ) {

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if ( ! isset( $pointer[ $key ] ) ) {

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$pointer = empty( $pointer ) ? array() : $pointer;

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$pointer[ $key ] = array();

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}

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$pointer = &$pointer[ $key ];

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}

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$pointer = $value;

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}

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public function ensure_array( $array ) {

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return empty( $array ) || ! is_array( $array )

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? array()

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: $array;

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}

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/**

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* WARNING: This trick works only for arrays in which all the values are valid keys.

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* @see https://stackoverflow.com/a/8321701

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* @param $array scalar[]

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* @return array Unique array

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public function fast_array_unique( $array ) {

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if ( ! is_array( $array ) ) {

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return array();

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}

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return array_keys( array_flip( $array ) );

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}

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}

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