class-array-utils.php
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<?php
namespace Smush\Core;
class Array_Utils {
public function array_hash( $array, $keys = array() ) {
$hash = 0;
if ( is_array( $array ) ) {
foreach ( $array as $key => $value ) {
if ( is_array( $value ) ) {
$value_hash = $this->array_hash(
$value,
array_merge( $keys, array( $key ) )
);
} else {
$prefix = join( '~', $keys );
$value_hash = crc32( $prefix . $value );
}
$hash += $value_hash;
}
}
return $hash;
}
public function get_array_value( $array, $key ) {
return isset( $array[ $key ] ) ? $array[ $key ] : null;
}
public function ensure_array( $array ) {
return empty( $array ) || ! is_array( $array )
? array()
: $array;
}
/**
* WARNING: This trick works only for arrays in which all the values are valid keys.
* @see https://stackoverflow.com/a/8321701
*
* @param $array scalar[]
*
* @return array Unique array
*/
public function fast_array_unique( $array ) {
if ( ! is_array( $array ) ) {
return array();
}
return array_keys( array_flip( $array ) );
}
}