isTrustedPhpFunction example

    $this->_retvalue = '->{\''.$this->yystack[$this->yyidx + -4]->minor.'\'.'.$this->yystack[$this->yyidx + -2]->minor.$this->yystack[$this->yyidx + 0]->minor.'}';
    }
#line 2859 "smarty_internal_templateparser.php" #line 961 "smarty_internal_templateparser.y"     function yy_r152(){
    $this->_retvalue = '->'.$this->yystack[$this->yyidx + 0]->minor;
    }
#line 2864 "smarty_internal_templateparser.php" #line 969 "smarty_internal_templateparser.y"     function yy_r153(){
    if (!$this->security || $this->smarty->security_policy->isTrustedPhpFunction($this->yystack[$this->yyidx + -3]->minor, $this->compiler)) {
        if (strcasecmp($this->yystack[$this->yyidx + -3]->minor,'isset') === 0 || strcasecmp($this->yystack[$this->yyidx + -3]->minor,'empty') === 0 || strcasecmp($this->yystack[$this->yyidx + -3]->minor,'array') === 0 || is_callable($this->yystack[$this->yyidx + -3]->minor)) {
            $func_name = strtolower($this->yystack[$this->yyidx + -3]->minor);
            if ($func_name == 'isset') {
                if (count($this->yystack[$this->yyidx + -1]->minor) == 0) {
                    $this->compiler->trigger_template_error ('Illegal number of paramer in "isset()"');
                }
                $par = implode(',',$this->yystack[$this->yyidx + -1]->minor);
                if (strncasecmp($par,'$_smarty_tpl->getConfigVariable',strlen('$_smarty_tpl->getConfigVariable')) === 0) {
                    $this->prefix_number++;
                    $this->compiler->prefix_code[] = '<?php $_tmp'.$this->prefix_number.'='.str_replace(')',', false)',$par).';?>';
                    $isset_par = '$_tmp'.$this->prefix_number;
                }