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Reference: What is variable scope, which variables are accessible from where and what are “undefined
What is "variable scope" in PHP? Are variables from one .php file accessible in another? Why do I sometimes get "undefined variable" errors?
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Is it worth using Python's re.compile?
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dF.dF.
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Best way to initialize (empty) array in PHP
...creation and instantiation. I wonder whether there are any equivalences in PHP?
8 Answers
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Removing X-Powered-By
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I think that is controlled by the expose_php setting in PHP.ini:
expose_php = off
Decides whether PHP may expose the fact that it is installed on the server (e.g. by adding its signature to the Web server header). It is no security threat in any way, but it ma...
PHP - Extracting a property from an array of objects
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If you have PHP 5.5 or later, the best way is to use the built in function array_column():
$idCats = array_column($cats, 'id');
But the son has to be an array or converted to an array
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How can I select and upload multiple files with HTML and PHP, using HTTP POST?
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This is possible in HTML5. Example (PHP 5.4):
<!doctype html>
<html>
<head>
<title>Test</title>
</head>
<body>
<form method="post" enctype="multipart/form-data">
<input ...
Regex: match everything but specific pattern
...thing but a string starting with a specific pattern (specifically index.php and what follows, like index.php?id=2342343 )
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getenv() vs. $_ENV in PHP
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According to the php documentation about getenv, they are exactly the same, except that getenv will look for the variable in a case-insensitive manner. Most of the time it probably doesn't matter, but one of the comments on the documentation...
How to validate an email address in PHP
...k out this list for tests (both failed and succeeded) of the regex used by PHP's filter_var() function.
Even the built-in PHP functions, email clients or servers don't get it right. Still in most cases filter_var is the best option.
If you want to know which regex pattern PHP (currently) uses to ...
What does yield mean in PHP?
...reach (xrange(1, 10) as $key => $value) {
echo "$key => $value", PHP_EOL;
}
This would create the following output:
0 => 1
1 => 2
…
9 => 10
You can also control the $key in the foreach by using
yield $someKey => $someValue;
In the generator function, $someKey is whate...