2019 Update Starting from PHP 7.3, there is a new built in function called array_key_first() which will retrieve the first key from the given array without resetting the internal pointer. Check out the documentation for more info. You can use reset and key: reset($array); $first_key = key($array); It’s essentially the same as your initial code, … Read more
People from other scripting languages always think theirs is better because they have a built-in function to do that and not PHP (I am looking at Pythonistas right now :-)). In fact, it does exist, but few people know it. Meet pathinfo(): $ext = pathinfo($filename, PATHINFO_EXTENSION); This is fast and built-in. pathinfo() can give you … Read more
No output before sending headers! Functions that send/modify HTTP headers must be invoked before any output is made. summary ⇊ Otherwise the call fails: Warning: Cannot modify header information – headers already sent (output started at script:line) Some functions modifying the HTTP header are: header / header_remove session_start / session_regenerate_id setcookie / setrawcookie Output can … Read more
You don’t typically need to do this, since PHP will coerce the type for you in most circumstances. For situations where you do want to explicitly convert the type, cast it: $num = “3.14”; $int = (int)$num; $float = (float)$num;
You have asked two questions that are not quite equivalent: Firstly, how to determine whether an array has only numeric keys Secondly, how to determine whether an array has sequential numeric keys, starting from 0 Consider which of these behaviours you actually need. (It may be that either will do for your purposes.) The first … Read more
PHP strings can be specified not just in two ways, but in four ways. Single quoted strings will display things almost completely “as is.” Variables and most escape sequences will not be interpreted. The exception is that to display a literal single quote, you can escape it with a back slash \’, and to display … Read more
Needed background on concurrency approaches: Different web servers implement different techniques for handling incoming HTTP requests in parallel. A pretty popular technique is using threads — that is, the web server will create/dedicate a single thread for each incoming request. The Apache HTTP web server supports multiple models for handling requests, one of which (called … Read more
Just typecast it $array = (array) $yourObject; From Arrays: If an object is converted to an array, the result is an array whose elements are the object’s properties. The keys are the member variable names, with a few notable exceptions: integer properties are unaccessible; private variables have the class name prepended to the variable name; … Read more
As you’re dealing with an array of strings, you can simply use array_filter(), which conveniently handles all this for you: print_r(array_filter($linksArray)); Keep in mind that if no callback is supplied, all entries of array equal to FALSE (see converting to boolean) will be removed. So if you need to preserve elements that are i.e. exact … Read more
To answer this question specifically, two problems: $randstring is not in scope when you echo it. The characters are not getting concatenated together in the loop. Here’s a code snippet with the corrections: function generateRandomString($length = 10) { $characters=”0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ”; $charactersLength = strlen($characters); $randomString = ”; for ($i = 0; $i < $length; $i++) { $randomString … Read more