Php eval parse errors

eval

The eval() language construct is very dangerous because it allows execution of arbitrary PHP code. Its use thus is discouraged. If you have carefully verified that there is no other option than to use this construct, pay special attention not to pass any user provided data into it without properly validating it beforehand.

Parameters

Valid PHP code to be evaluated.

The code must not be wrapped in opening and closing PHP tags, i.e. ‘echo «Hi!»;’ must be passed instead of » . It is still possible to leave and re-enter PHP mode though using the appropriate PHP tags, e.g. ‘echo «In PHP mode!»; ?>In HTML mode!

Apart from that the passed code must be valid PHP. This includes that all statements must be properly terminated using a semicolon. ‘echo «Hi!»‘ for example will cause a parse error, whereas ‘echo «Hi!»;’ will work.

A return statement will immediately terminate the evaluation of the code.

The code will be executed in the scope of the code calling eval() . Thus any variables defined or changed in the eval() call will remain visible after it terminates.

Return Values

eval() returns null unless return is called in the evaluated code, in which case the value passed to return is returned. As of PHP 7, if there is a parse error in the evaluated code, eval() throws a ParseError exception. Before PHP 7, in this case eval() returned false and execution of the following code continued normally. It is not possible to catch a parse error in eval() using set_error_handler() .

Examples

Example #1 eval() example — simple text merge

$string = ‘cup’ ;
$name = ‘coffee’ ;
$str = ‘This is a $string with my $name in it.’ ;
echo $str . «\n» ;
eval( «\$str = \» $str \»;» );
echo $str . «\n» ;
?>

The above example will output:

This is a $string with my $name in it. This is a cup with my coffee in it.

Notes

Note: Because this is a language construct and not a function, it cannot be called using variable functions, or named arguments.

As with anything that outputs its result directly to the browser, the output-control functions can be used to capture the output of this function, and save it in a string (for example).

Note:

In case of a fatal error in the evaluated code, the whole script exits.

See Also

User Contributed Notes 20 notes

Kepp the following Quote in mind:

If eval() is the answer, you’re almost certainly asking the
wrong question. — Rasmus Lerdorf, BDFL of PHP

At least in PHP 7.1+, eval() terminates the script if the evaluated code generate a fatal error. For example:
@eval( ‘$content = (100 — );’ );
?>

(Even if it is in the man, I’m note sure it acted like this in 5.6, but whatever)
To catch it, I had to do:
try eval( ‘$content = (100 — );’ );
> catch ( Throwable $t ) $content = null ;
>
?>

This is the only way I found to catch the error and hide the fact there was one.

Inception Start:
eval( «echo ‘Inception lvl 1. \n’; eval(‘echo \»Inception lvl 2. \n\»; eval(\»echo \’Inception lvl 3. \n\’; eval(\’echo \\\»Limbo!\\\»;\’);\»);’);» );
?>

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ParseError

ParseError is thrown when an error occurs while parsing PHP code, such as when eval() is called.

Note: ParseError extends CompileError as of PHP 7.3.0. Formerly, it extended Error .

Class synopsis

User Contributed Notes 2 notes

The priority of Parse Error should be higher than that of Fatal Error,Parse Error, which has the highest priority among all PHP exceptions. See the following example:
error_reporting ( E_ALL );
test ()
//System output a parse error
?>
error_reporting ( E_WARNING );
test ()
//System output a parse error
?>
error_reporting ( E_ERROR );
test ()
//System output a parse error
?>
error_reporting ( E_PARSE );
test ()
//System output a parse error
?>

/*
* The function eval() evaluate his argument as an instruction PHP
* Then the argument must respect the standar of PHP codage
* In this example the semicolon are missign
*/

/*
* If you run this code the result is different of the result of above code
* PHP will output the standar parse Error: syntax error, .
*

• Predefined Exceptions
  • Exception
  • ErrorException
  • Error
  • ArgumentCountError
  • ArithmeticError
  • AssertionError
  • DivisionByZeroError
  • CompileError
  • ParseError
  • TypeError
  • ValueError
  • UnhandledMatchError
  • FiberError

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  Php Eval Parse Error

  

  We have collected for you the most relevant information on Php Eval Parse Error, as well as possible solutions to this problem. Take a look at the links provided and find the solution that works. Other people have encountered Php Eval Parse Error before you, so use the ready-made solutions.

  how to handle parse error for eval function in php — Stack .

  https://stackoverflow.com/questions/10085284/how-to-handle-parse-error-for-eval-function-in-php
  From the manual As of PHP 7, if there is a parse error in the evaluated code, eval () throws a ParseError exception. Before PHP 7, in this case eval () returned FALSE and execution of the …

  How can I catch a parse error in php eval()? — Stack Overflow

  https://stackoverflow.com/questions/63345761/how-can-i-catch-a-parse-error-in-php-eval
  Your code doesn’t work as expected because, in PHP, an undefined variable doesn’t trigger a parse error but a notice instead. Thanks to set_error_handler native function, you can convert a notice to error then catch it with this PHP 7 code:

  PHP: ParseError — Manual

  https://www.php.net/manual/en/class.parseerror.php
  ParseError is thrown when an error occurs while parsing PHP code, such as when eval () is called. Note: ParseError extends CompileError as of PHP 7.3.0. Formerly, it extended Error.

  Parse error in template.php: eval()’d code phpBB Smith

  http://www.phpbbsmith.com/parse-error-templatephp-evald-code
  Switch statements are case and space sensitive. This means they must begin with .Almost all characters other than spaces are allowed in switch names.

  PHP: ParseError — Manual

  https://www.php.net/manual/zh/class.parseerror.php
  * The function eval() evaluate his argument as an instruction PHP * Then the argument must respect the standar of PHP codage * In this example the semicolon are missign

  PHP Errors: 4 Different Types (Warning, Parse, Fatal, and .

  https://phoenixnap.com/kb/php-error-types
  Aug 06, 2019 · A PHP Error occurs when something is wrong in the PHP code. The error can be as simple as a missing semicolon, or as complex as calling an incorrect variable. To efficiently resolve a PHP issue in a script, you must understand what kind of problem is occurring. The four types of PHP errors are:

  PHP: eval — Manual

  https://www.php.net/manual/en/function.eval.php
  eval () returns null unless return is called in the evaluated code, in which case the value passed to return is returned. As of PHP 7, if there is a parse error in the evaluated code, eval () throws a ParseError exception. Before PHP 7, in this case eval () returned false and execution of the following code continued normally.

  phpBB • Knowledge Base > Parse error: eval()’d code

  https://www.phpbb.com/support/docs/en/3.3/kb/article/parse-error-evald-code
  This is due to how phpBB handles and ‘s. The template system is set-up to interpret these in special ways, such as loops and switches, and not having such an object between them results in parse errors.

  PHP Parse Error in php.module(80) : eval()’d code on line .

  PHP eval() Function — W3Schools

  https://www.w3schools.com/PHP/func_misc_eval.asp
  Definition and Usage. The eval() function evaluates a string as PHP code. The string must be valid PHP code and must end with semicolon. Note: A return statement will terminate the evaluation of the string immediately. Tip: This function can be useful for storing PHP code in a …

  Php Eval Parse Error Fixes & Solutions

  We are confident that the above descriptions of Php Eval Parse Error and how to fix it will be useful to you. If you have another solution to Php Eval Parse Error or some notes on the existing ways to solve it, then please drop us an email.

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  Php Eval Parse Error Catch

  

  We have collected for you the most relevant information on Php Eval Parse Error Catch, as well as possible solutions to this problem. Take a look at the links provided and find the solution that works. Other people have encountered Php Eval Parse Error Catch before you, so use the ready-made solutions.

  how to handle parse error for eval function in php — Stack .

  https://stackoverflow.com/questions/10085284/how-to-handle-parse-error-for-eval-function-in-php
  From the manual As of PHP 7, if there is a parse error in the evaluated code, eval () throws a ParseError exception. Before PHP 7, in this case eval () returned FALSE and execution of the following code …

  PHP: ParseError — Manual

  https://www.php.net/manual/en/class.parseerror.php
  ParseError is thrown when an error occurs while parsing PHP code, such as when eval () is called. Note: ParseError extends CompileError as of PHP 7.3.0. Formerly, it extended Error.

  PHP: eval — Manual

  https://www.php.net/manual/en/function.eval.php
  To catch a parse error in eval ()’ed code with a custom error handler, use error_get_last () (PHP >= 5.2.0).

  PHP: ParseError — Manual

  https://www.php.net/manual/zh/class.parseerror.php
  * The function eval() evaluate his argument as an instruction PHP * Then the argument must respect the standar of PHP codage * In this example the semicolon are missign

  PHP :: Request #41810 :: Unable to catch Parse Errors

  http://bugs.php.net/bug.php?id=41810
  [2012-10-05 21:05 UTC] [email protected] Even in the templating case there really is no excuse for pushing templates with parse errors to production. Running «php -l» as part of your pre-push testing is the expected bare minimum and hopefully you have actual …

  PHP eval and capturing errors (as much as possible)

  https://www.iditect.com/how-to/53073704.html
  I need to catch some warnings being thrown from some php native functions and then handle them. Specifically: array dns_get_record ( string $ The eval() function evaluates a string as PHP code.

  PHP :: Bug #28290 :: Throwing exception in eval’led code .

  http://bugs.php.net/bug.php?id=28290
  Now if you were right, then the above code should execute both echos. It does not, so is that a bug? I say it’s a catch 22. Either this program, or the one with the ‘eval’ works out wrong. Personally I believe the whole idea of ‘throwing an exception’ is that you bypass all intermediate code and land straight into the ‘catch…

  PHP :: Request #41810 :: Unable to catch Parse Errors

  https://bugs.php.net/bug.php?id=41810&edit=1
  Welcome! If you don’t have a Git account, you can’t do anything here. You can add a comment by following this link or if you reported this bug, you can edit this bug over here.

  PHP :: Request #43177 :: Errors in eval()’ed code produce .

  http://bugs.php.net/43177
  Request #43177: Errors in eval()’ed code produce status code 500: Submitted: 2007-11-02 11:41 UTC: Modified: 2011-04-08 21:15 UTC

  Errors with basic PHP template using eval()

  https://www.xspdf.com/resolution/2040029.html
  The Land Where PHP Uses eval(), eval is used here for replacement : the value is in the name variable, and the incoming argument is a kind of a template. The secure way to do this No alternative of eval function in php , means what eval function do in php no other function can do . it run php code . PHP eval …

  Php Eval Parse Error Catch Fixes & Solutions

  We are confident that the above descriptions of Php Eval Parse Error Catch and how to fix it will be useful to you. If you have another solution to Php Eval Parse Error Catch or some notes on the existing ways to solve it, then please drop us an email.

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