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How can I sanitize user input with PHP?
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It's a common misconception that user input can be filtered. PHP even has a (now deprecated) "feature", called magic-quotes, that builds on this idea. It's nonsense. Forget about filtering (or cleaning, or whatever people call it).
What you should do, to avoid problems, is quite simpl...
How do I strip all spaces out of a string in PHP? [duplicate]
How can I strip / remove all spaces of a string in PHP?
4 Answers
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Which MySQL datatype to use for an IP address? [duplicate]
...Pv6 addresses you could use a BINARY instead:
`ipv6` BINARY(16)
And use PHP’s inet_pton and inet_ntop for conversion:
'INSERT INTO `table` (`ipv6`) VALUES ("'.mysqli_real_escape_string(inet_pton('2001:4860:a005::68')).'")'
'SELECT `ipv6` FROM `table`'
$ipv6 = inet_pton($row['ipv6']);
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How can I use break or continue within for loop in Twig template?
...milar behaviour to the built-in break and continue statements like in flat PHP.
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Using str_replace so that it only acts on the first match?
...ormance', if performance were the primary concern, we would not be writing PHP! Something other than '/' could be used to wrap the pattern, perhaps '~', which would help avoid the escaping problem to some degree. It depends what the data is, and where it came from.
– ThomasReds...
How do I use the ternary operator ( ? : ) in PHP as a shorthand for “if / else”?
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PHP 7+
As of PHP 7, this task can be performed simply by using the Null coalescing operator like this :
echo !empty($address['street2']) ?? 'Empty';
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git diff two files on same branch, same commit
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You don't need git for that, just use diff fileA.php fileB.php (or vimdiff if you want side by side comparison)
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Do htmlspecialchars and mysql_real_escape_string keep my PHP code safe from injection?
... check that a variable we were using as a number, was actually numeric. In PHP you should widely use a set of functions to check that inputs are integers, floats, alphanumeric etc. But when it comes to SQL, heed most the value of the prepared statement. The above code would have been secure if it ...
How to convert an image to base64 encoding?
...ts("/path/to/image.jpg");
// alternatively specify an URL, if PHP settings allow
$base64 = base64_encode($imagedata);
bear in mind that this will enlarge the data by 33%, and you'll have problems with files whose size exceed your memory_limit.
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Fastest way to implode an associative array with keys
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Was trying to find this method in the PHP API myself this is definitely the way to go. If not the alternative is to use a modified implode method such as uk2.php.net/manual/en/function.implode.php#84684 but http_build_query() will properly be faster.
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