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<?php
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/**
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* Smarty error handler to fix new error levels in PHP8 for backwards compatibility
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*
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* @package Smarty
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* @subpackage PluginsInternal
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* @author Simon Wisselink
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*
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*/
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class Smarty_Internal_ErrorHandler
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{
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/**
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* Allows {$foo} where foo is unset.
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* @var bool
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*/
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public $allowUndefinedVars = true;
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/**
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* Allows {$foo.bar} where bar is unset and {$foo.bar1.bar2} where either bar1 or bar2 is unset.
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* @var bool
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*/
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public $allowUndefinedArrayKeys = true;
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/**
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* Allows {$foo->bar} where bar is not an object (e.g. null or false).
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* @var bool
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*/
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public $allowDereferencingNonObjects = true;
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private $previousErrorHandler = null;
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/**
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* Enable error handler to intercept errors
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*/
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public function activate() {
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/*
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Error muting is done because some people implemented custom error_handlers using
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https://php.net/set_error_handler and for some reason did not understand the following paragraph:
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It is important to remember that the standard PHP error handler is completely bypassed for the
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error types specified by error_types unless the callback function returns FALSE.
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error_reporting() settings will have no effect and your error handler will be called regardless -
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however you are still able to read the current value of error_reporting and act appropriately.
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Of particular note is that this value will be 0 if the statement that caused the error was
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prepended by the @ error-control operator.
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*/
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$this->previousErrorHandler = set_error_handler([$this, 'handleError']);
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}
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/**
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* Disable error handler
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*/
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public function deactivate() {
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restore_error_handler();
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$this->previousErrorHandler = null;
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}
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/**
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* Error Handler to mute expected messages
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*
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* @link https://php.net/set_error_handler
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*
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* @param integer $errno Error level
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* @param $errstr
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* @param $errfile
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* @param $errline
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* @param $errcontext
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*
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* @return bool
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*/
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public function handleError($errno, $errstr, $errfile, $errline, $errcontext = [])
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{
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if ($this->allowUndefinedVars && preg_match(
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'/^(Attempt to read property "value" on null|Trying to get property (\'value\' )?of non-object)/',
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$errstr
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)) {
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return; // suppresses this error
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}
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if ($this->allowUndefinedArrayKeys && preg_match(
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'/^(Undefined index|Undefined array key|Trying to access array offset on value of type)/',
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$errstr
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)) {
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return; // suppresses this error
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}
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if ($this->allowDereferencingNonObjects && preg_match(
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'/^Attempt to read property ".+?" on/',
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$errstr
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)) {
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return; // suppresses this error
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}
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// pass all other errors through to the previous error handler or to the default PHP error handler
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return $this->previousErrorHandler ?
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call_user_func($this->previousErrorHandler, $errno, $errstr, $errfile, $errline, $errcontext) : false;
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}
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}
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