57 lines
1.6 KiB
PHP
57 lines
1.6 KiB
PHP
<?php
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/**
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* Class that defers a slow string generation until the string is actually needed.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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*/
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/**
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* @since 1.25
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*/
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class DeferredStringifier {
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/** @var callable Callback used for result string generation */
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private $callback;
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/** @var array */
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private $params;
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/** @var string */
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private $result;
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/**
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* @param callable $callback Callback that gets called by __toString
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* @param mixed $param,... Parameters to the callback
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*/
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public function __construct( $callback /*...*/ ) {
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$this->params = func_get_args();
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array_shift( $this->params );
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$this->callback = $callback;
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}
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/**
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* Get the string generated from the callback
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*
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* @return string
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*/
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public function __toString() {
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if ( $this->result === null ) {
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$this->result = call_user_func_array( $this->callback, $this->params );
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}
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return $this->result;
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}
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}
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