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SHA1 vs md5 vs SHA256: which to use for a PHP login?

I'm making a php login, and I'm trying to decide whether to use SHA1 or Md5, or SHA256 which I read about in another stackoverflow article. Are any of them more secure than others? For SHA1/256, do I still use a salt? ...
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Logical Operators, || or OR?

...nlike many other languages where they return the last value checked. So in PHP (27 || 0) returns true, not 27. – TextGeek Sep 15 '17 at 15:32 ...
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PHP - Merging two arrays into one array (also Remove Duplicates)

... array_unique(array_merge($array1,$array2), SORT_REGULAR); http://se2.php.net/manual/en/function.array-unique.php share | improve this answer | follow | ...
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Ruby function to remove all white spaces?

...ction to remove all white spaces? I'm looking for something kind of like PHP's trim() ? 23 Answers ...
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What is the difference/usage of homebrew, macports or other package installation tools? [closed]

... a problem with it, and my entire Unix ecosystem relay on it. If you are a PHP developer you can install the last version of Apache (Mac OS X uses 2.2), PHP and all the extensions you need, then upgrade all with one command. Forget to do the same with Homebrew. MacPorts support groups. foo@macpro:~...
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PHP DOMDocument loadHTML not encoding UTF-8 correctly

...loadHTML('<?xml encoding="utf-8" ?>' . $content); fixed it for me in PHP7 (so it is still an issue) - this is a really annoying problem, because I defined utf8 in the HTML document (with <meta charset="UTF-8" />) but that has no effect, it seems to need the <?xml part, which is totall...
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How to encrypt/decrypt data in php?

I'm currently a student and I'm studying PHP, I'm trying to make a simple encrypt/decrypt of data in PHP. I made some online research and some of them were quite confusing(at least for me). ...
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Check if $_POST exists

...ugustus Francis's answer, empty() is not correct for choice #1, because in php, the string '0' is equivalent to false - and empty() returns true for all values equivalent to false. So using empty, the code would skip printing if the value was '0'. If you want to exclude the empty string, see Augustu...
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PHP array delete by value (not key)

I have a PHP array as follows: 18 Answers 18 ...
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How to display HTML tags as plain text [duplicate]

... If the question's text were to be generated by PHP, htmlspecialchars() does what this answer suggests: replace the less-than and greater-than signs (and others) with their HTML entities. But the question does not specify, so this more general answer is a superset of all t...