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"Variable is never used" in foreach loops [message #1792520]

Thu, 19 July 2018 02:00

Yurij Zagrebnoy

Messages: 2
Registered: August 2013

Junior Member

Hi,

I often use PHP foreach to iterate over array keys, like:

foreach ($list_of_keys as $key => $_) {
// ...
}

This is about 2 times faster on big arrays and doesn't consume additional memory compared to using array_keys()

foreach (array_keys($list_of_keys) as $key) {
// ...
}

The problem is that each $_ variable produces warning "Variable $_ is never used".

Is there any way to configure PHP Validator to exclude variables with certain names from checking their usage?

BTW Thank you for your great work on PDT!

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Re: "Variable is never used" in foreach loops [message #1793466 is a reply to message #1792520]

Wed, 08 August 2018 18:03

Moses Lecce

Messages: 2
Registered: July 2009

Junior Member

I am also experiencing this issue, which basically means I have a bunch of warnings that can't really be resolved without implementing less optimized code.

In addition to this, I have code in third party files (that I do not wish to edit and correct) which come up as warnings (is there a way to exclude a file/directory from warnings, I cannot find such a setting).

Another scenario I cannot seem to handle is something where you are using a reference variable:

e.g.
$this = array();
$this2 =& $this;
$this2[] = "a";

Will tell me that $this2 is never used.

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Re: "Variable is never used" in foreach loops [message #1794915 is a reply to message #1793466]

Tue, 11 September 2018 05:53

Vladimir Paramygin

Messages: 1
Registered: September 2018

Junior Member

Yeah, having the same problem. Upgraded to Photon yesterday and now my project is littered with warnings about undefined and unused variables :(

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Re: "Variable is never used" in foreach loops [message #1796669 is a reply to message #1792520]

Wed, 17 October 2018 09:42

Fladnag Fladnag

Messages: 1
Registered: October 2018

Junior Member

you can avoid this error with... this comment, before variable usage :

/** @var mixed $key */

But yes, Photon PDT validation is a nightmare... :
- too many false positive (output variable is undeclared, page fragment variable is undeclared, global variable is undeclared, array variable access is undeclared)
- type in comments are checked... and send ERROR if not found. You can lower or disabled it, but not for comments only.
- etc...

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