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Closed 13 years ago.
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What is the use of # symbol in php?
I like to know the purpose and meaning of # in php codes.
For instance, #umask or #ini_set. What's the difference without # and with #?
PHP's error suppress operator used to suppress error messages.
SideNote: Avoid it as much as you can, also it slows down performance heavily and not allowed to be used in ini_get and ini_set functions in future php versions.
"Swallow an error", continue despite an error occuring. An non-critical operation augmented with # will not abort script execution.
# symbol is an error control operator check out manual here
Related
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Reference Guide: What does this symbol mean in PHP? (PHP Syntax)
(24 answers)
Closed 9 years ago.
I'm learning object oriented php.
I've come across some code I don't fully understand.
This code is within a class.
1) code that uses #.
For example:
$this->image = #imagecreatefromgif($filename);
Can some one explain the uses of #.
2)
Also it looks like the script is declaring variables in a way i'm not used to (the $var way).
For example:
$this->ext = $size['mime'];
$ext is not declared before this code is used, but it used after it. Does this create an $ext variable within the object?
Thanks guys!!
The # will suppress errors so that no errors will be shown for that expression.
http://php.net/manual/en/language.operators.errorcontrol.php
# is php's error suppression operator you should never use it
You should handle error instead ignoring and advantage would be you will get long notice which is helpful to debug too
And worst case would be below as described in manual
Currently the "#" error-control operator prefix will even disable error reporting for critical errors that will terminate script execution. Among other things, this means that if you use "#" to suppress errors from a certain function and either it isn't available or has been mistyped, the script will die right there with no indication as to why.
# Means "Suppress warning when calling this function".
This question already has answers here:
What is the use of the # symbol in PHP?
(11 answers)
Closed 9 years ago.
What is the meaning of ##variable in php ?
$fix=##parts;
# is used to suppress any errors that may occur on this line of the code
http://php.net/manual/en/language.operators.errorcontrol.php
When prepended to an expression in PHP, any error messages that might
be generated by that expression will be ignored.
I would not recommend using it at all because this may result in failure of noticing some important error/warning and make debugging a havoc. On a production environment use error_reporting setting that will prevent any errors or warning from showing up while on a development server I would recommend to turn on any error reporting
PHP supports one error control operator: the at sign (#). When
prepended to an expression in PHP, any error messages that might be
generated by that expression will be ignored.
Link : PHP.net explanation
The #operator turns off error handling.
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Should I use # in my PHP code?
(6 answers)
Closed 9 years ago.
Is writing:
$name = #$_GET['name'];
instead of:
$name = isset($_GET['name']) ? $_GET['name'] : null;
is some bad coding practice? Can I use # as a normal operator or only in some specific cases?
Yes, using the # operator is considered bad practice.
It is well documented that it has performance implications.
In addition, supressing error messages is a sign of bad practice; you should write your code to expect errror and handle them defensively. Simply swallowing the errors behind an # symbol means that your code will never know that the error occurred, nor what the error actually was; this can often lead to further problems later in your code.
There are some cases where it is unavoidable to use # but this is not one of them, so you should avoid doing it.
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Closed 10 years ago.
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What is the use of # symbol in php?
PHP functions and #functions
What does the “#” symbol do in SQL?
Often when looking through online resources / questions including code on this website, I often come across the '#' operator.
In the PHP code I see, the # operator generally comes before a method such as #fread(). However, by the looks of the code, it wouldn't have actually made a difference whether or not fread() was called with or without the '#' in front of the method.
In the MySQL code, the # operator generally comes before a column/field name. I believe that the # is used to access a default variable instantiated at some point manually by the user, alike to an env variable in PHP.
Please can you tell me if my assumptions are correct, and if not, when and why the '#' sign or operator should in fact be used?
Thanks,
Max.
In PHP it means suppress any notices/warnings raised by this function eg mail() will throw an error when it fails to send. You can do
$Success = #mail(...)
To suppress the error and handle success/failure yourself. See the Error Control Operator page for more information.
In MySQL, # is used to prefix user-defined variables
In PHP the at sign (#) denotes that any error messages that might be generated by that expression will be ignored.
In MySQL the # before a name denotes a local, user-defined variable.
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What does # mean in PHP? [duplicate]
(5 answers)
Closed 8 years ago.
I am a newbie in PHP.
I do not know the meaning of #, for example:
$key = #$_REQUEST['key'];
I have searched in google but can not find anything.
Some help me! Please !
The # symbol tells the function to fail silently instead of dumping some sort of error message. It is listed under error control operators in the PHP manual.
It suppresses any errors that the line would normally produce. In this case if the key doesn't exist, an error will occur but the error text will be silenced.
It suppresses errors and warnings.
You've found the error control operator!
It suppresses warnings in PHP. In that example it could be used to suppress and undefined index warning, if $_REQUEST['key'] doesn't exist. It's usually better practice to write:
$key = isset($_REQUEST['key']) ? $_REQUEST['key'] : 'default value for key here';