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

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<?php
/**
 * Smarty Internal Plugin Compile Eval
 *
 * Compiles the {eval} tag.
 *
 * @package Smarty
 * @subpackage Compiler
 * @author Uwe Tews
 */

/**
 * Smarty Internal Plugin Compile Eval Class
 *
 * @package Smarty
 * @subpackage Compiler
 */
class Smarty_Internal_Compile_Eval extends Smarty_Internal_CompileBase {

    /**
     * Attribute definition: Overwrites base class.
     *
     * @var array
     * @see Smarty_Internal_CompileBase
     */
    public $required_attributes = array('var');
    /**
     * Attribute definition: Overwrites base class.
     *
     * @var array
     * @see Smarty_Internal_CompileBase
     */
    public $optional_attributes = array('assign');
    /**
     * Attribute definition: Overwrites base class.
     *
     * @var array
     * @see Smarty_Internal_CompileBase
     */
    public $shorttag_order = array('var','assign');

    /**
     * Compiles code for the {eval} tag
     *
     * @param array  $args     array with attributes from parser
     * @param object $compiler compiler object
     * @return string compiled code
     */
    public function compile($args, $compiler)
    {
        $this->required_attributes = array('var');
        $this->optional_attributes = array('assign');
        // check and get attributes
        $_attr = $this->getAttributes($compiler, $args);
        if (isset($_attr['assign'])) {
              // output will be stored in a smarty variable instead of beind displayed
            $_assign = $_attr['assign'];
        }

        // create template object