53 lines
1.1 KiB
PHP
53 lines
1.1 KiB
PHP
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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( $array, $key ) {
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return isset( $array[ $key ] ) ? $array[ $key ] : null;
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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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*
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* @param $array scalar[]
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*
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* @return array Unique array
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*/
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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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