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Difference between array_map, array_walk and array_filter
...ray_filter . What I could see from documentation is that you could pass a callback function to perform an action on the supplied array. But I don't seem to find any particular difference between them.
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Ruby function to remove all white spaces?
What is the Ruby function to remove all white spaces? I'm looking for something kind of like PHP's trim() ?
23 Answers
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Find the last element of an array while using a foreach loop in PHP
...x compared to this one. I have not ran any tests but I guess this answer shall be faster as it is not extracting array of keys.This shall have O(1) speed
– Vaibhav Kamble
Mar 20 '09 at 7:09
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Change all files and folders permissions of a directory to 644/755
How would I change all files to 644 and all folders to 755 using chmod from the linux command prompt? (Terminal)
8 Answ...
Is there a use-case for singletons with database access in PHP?
...bsolutely sure that you'll never have more than one instance of, you eventually have a second. You may end up with a second monitor, a second database, a second server--whatever.
When this happens, if you have used a static class you're in for a much worse refactor than if you had used a singleton...
PHP DateTime::modify adding and subtracting months
...s not a bug:
The current behavior is correct. The following happens internally:
+1 month increases the month number (originally 1) by one. This makes the date 2010-02-31.
The second month (February) only has 28 days in 2010, so PHP auto-corrects this by just continuing to count days from February...
Convert a series of parent-child relationships into a hierarchical tree?
...o '</ul>';
}
}
You'll only save 8 iterations on a dataset as small as this but on bigger sets it could make a difference.
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How to know which version of Symfony I have?
...ttpKernel\Kernel for where const VERSION is defined. Example on GitHub
Locally this would be located in vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Kernel.php.
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How can I catch a “catchable fatal error” on PHP type hinting?
...assA::method_a() must be an instance of ClassB, instance of ClassA given, called in [...]
catched: Argument 1 passed to ClassA::method_a() must be an instance of ClassB, instance of ClassWrong given, called in [...]
method_a: ClassB
method_a: ClassC
done.
Old answer for pre-php7 versions:
http:/...
Type-juggling and (strict) greater/lesser-than comparisons in PHP
...RUE); // bool(false)
Extra: PHP's < operator is not trichotomous, i.e. all of $a < $b, $b < $a and $a == $b can be false (Example same as for <= not being total).
Extra: PHP's < operator can be circular, i.e. it is possible that $a < $b, $b < $c and $c < $a:
var_dump(INF &...