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