ThinkPHP/Library/Vendor/Smarty/sysplugins/smarty_internal_compile_foreach.php

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<?php
/**
 * Smarty Internal Plugin Compile Foreach
 *
 * Compiles the {foreach} {foreachelse} {/foreach} tags
 *
 * @package Smarty
 * @subpackage Compiler
 * @author Uwe Tews
 */

/**
 * Smarty Internal Plugin Compile Foreach Class
 *
 * @package Smarty
 * @subpackage Compiler
 */
class Smarty_Internal_Compile_Foreach extends Smarty_Internal_CompileBase {
    /**
     * Attribute definition: Overwrites base class.
     *
     * @var array
     * @see Smarty_Internal_CompileBase
     */
    public $required_attributes = array('from', 'item');
    /**
     * Attribute definition: Overwrites base class.
     *
     * @var array
     * @see Smarty_Internal_CompileBase
     */
    public $optional_attributes = array('name', 'key');
    /**
     * Attribute definition: Overwrites base class.
     *
     * @var array
     * @see Smarty_Internal_CompileBase
     */
    public $shorttag_order = array('from','item','key','name');

    /**
     * Compiles code for the {foreach} tag
     *
     * @param array  $args      array with attributes from parser
     * @param object $compiler  compiler object
     * @param array  $parameter array with compilation parameter
     * @return string compiled code
     */
    public function compile($args, $compiler, $parameter)
    {
        $tpl = $compiler->template;
        // check and get attributes
        $_attr = $this->getAttributes($compiler, $args);

        $from = $_attr['from'];
        $item = $_attr['item'];
        if (!strncmp("\$_smarty_tpl->tpl_vars[$item]", $from, strlen($item) + 24)) {
            $compiler->trigger_template_error("item variable {$item} may not be the same variable as at 'from'", $compiler->lex->taglineno);
        }