ReplacementArray.php

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<?php
class ReplacementArray {
    private $data = [];

    public function __construct( array $data = [] ) {
        $this->data = $data;
    }

    public function __sleep() {
        return [ 'data' ];
    }

    public function setArray( array $data ) {
        $this->data = $data;
    }

    public function getArray() {
        return $this->data;
    }

    public function setPair( $from, $to ) {
        $this->data[$from] = $to;
    }

    public function mergeArray( $data ) {
        $this->data = $data + $this->data;
    }

    public function merge( ReplacementArray $other ) {
        $this->data = $other->data + $this->data;
    }

    public function removePair( $from ) {
        unset( $this->data[$from] );
    }

    public function removeArray( $data ) {
        foreach ( $data as $from => $to ) {
            $this->removePair( $from );
        }
    }

    public function replace( $subject ) {
        return strtr( $subject, $this->data );
    }
}