By default array_reverse() will reset all numerical array keys to start counting from zero while literal keys will remain unchanged unless a second parameter preserve_keys is specified as true.To resolve that, since our array only has one element, we could use the following methods to return the first (also the only) element:Įcho array_shift($namesCopy) // output: null if array is emptyĮcho array_pop($namesCopy) // output: null if array is emptyĮcho implode($namesCopy) // output: '' if array is emptyĮcho $names_copy ? '' // output: '' if array index is not set or its value is null However, on the flip side there could potentially be an array offset problem when the input array is empty. The advantage to using this approach is that it doesn't modify the original array. This can be changed however, by specifying the fourth parameter preserve_keys as true.

Please note that by default array_slice() reorders and resets the numeric array indices. Next($names) // move array pointer to 2nd elementĮcho reset($namesCopy) // output: 'john'Īs you can see from the results, we've obtained the first element of the array without affecting the original.Įcho array_slice($names, 0, 1) // output: 'john' If you do not wish to reset the internal pointer of the array, you can work around it by creating a copy of the array simply by assigning it to a new variable before the reset() function is called, like so: This method has a simple syntax and support for older PHP versions:īe careful when resetting the array pointer as each array only has one internal pointer and you may not always want to reset it to point to the start of the array. The PHP reset() function not only resets the internal pointer of the array to the start of the array, but also returns the first array element, or false if the array is empty. Please note that we'll be using the following array for all the examples that follow: In PHP, there are a number of ways you could access the value of the first element of an out-of-order (or non-sequential) array. Get First Element of an Out-Of-Order or Non-Sequential Array However, starting from PHP 7.1, you can specify the specific key you're looking to unpack but we're not covering that since it's not within the scope of this article. $sequentialArray = Īccessing the First Element of Array Directly:Įcho $sequentialArray ? '' // output: 'foo'īy using ? (the null coalescing operator) you can return the first index if it's set and not null, or return an empty string otherwise.įor a non-sequential array this would throw an error because list() tries to unpack array values sequentially (starting from the first index - i.e. Consider for example the following array: It's fairly easy and straightforward to get the first element of a sequential array in PHP. Untested.Get First Element of an Array With Sequential Numeric Indexes Then loop through all devices on the rack and use the fields related to devicesįoreach($devices as $Device_Id => $arr):Īnyway, something like this should work. in this loop echo anything Rack Related under the key Rack.Įcho $devices.'' Then when rendering to the page you can use DB fields related to the RACK in the outside loop using the ‘Rack’ KEY and Device fields in the inner loop with the ‘Devices’ KEY. You can use both DB fields and hard coded KEYs to build the array in a more defined fashion. Well instead of building the array with an open KEY, e.g. Please copy and paste and try to understand exactly what is happening With so little information and data it is difficult to know what is required but anyway this is how I would tackle the problem: [ If doing this in php was the best way (see the next point in this list), indexing/pivoting the data, using the rack_id values, rather than the zero referenced numerical index, when you fetch it, would allow you to directly access any related data, rather than to loop over all data to try and find it.Ĭ) Since this is related/relational data values, the ‘R’ in RDBMS, just do all of this in one query, then produce the output you want from the data that the query btext editor are you usintg? If you are unable to view variables or step through then… The way I read the example is that you want to get the matching ‘title’, and perhaps other values, out of $racks, for the current rack_id.ī) In your proposed code, the $key value is the numerical index, having nothing to do with the rack_id values. Show at least two pieces of data in the first array and show both matching and non-matching data in the second array. You would need to show enough example data and the result you expect from that data so that someone would know what you mean by ‘it loops through the second one as long as the key (Rack_Id) are the same’. A) Your example doesn’t contain enough information to help you.

For loop in php to display array