php concatenate arrays



an addition to what julian egelstaff above wrote the array union operation () is not doing an array_unique it will just not use the keys that are already defined in the left array. the difference between union and merge can be seen in an example like this: <?php $arr['one'] = 'one'; $arr['two'] = 'two'; $arr['zero'] = 'zero';

php concatenate arrays

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php concatenate arrays

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is called the union operator, which differs from a concatenation operator (php doesn't have one for arrays). the description clearly says: the operator appends elements of reing keys from the right handed array to the left handed, whereas duplicated keys are not overwritten. with the example: $a = array("a"  definition and usage. the array_merge() function merges one or more arrays into one array. tip: you can assign one array to the function, or as many as you like. note: if two or more array elements have the same key, the last one overrides the others. note: if you assign only one array to the array_merge() function, and the 

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accordingly, merged arrays can be either preexisting arrays, as with $p_languages, or anonymous arrays, as with array('python'). you can't use array_push( ), because php won't automatically flatten out the array into series of independent variables, and you'll end up with a nested array. thus: array_push($p_languages  how to combine and merge arrays in php using the array_combine and array_merge functions, and the array union operator.

php concatenate arrays

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php concatenate arrays

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i've been working at a new job and the interesting thing when working with other people's code is you often learn a heap of stuff you didn't already know. a couple of weeks ago i came across a way to merge arrays in php with the operator, instead of using the array functions (e.g. array_merge) so share  just a quick post so i know where to look the next time i forget how to concatenate arrays in php. use array_merge to concatenate two numericallyindexed arrays; not array_push and not the array union operator: . $first = array('doh', 'ray', 'me'); $second = array('fah', 'soh', 'lah', 'te', 'do'); echo "union: " 

php concatenate arrays

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benchmarking php array concatenation. i recently began working on a contribution to a small programming contest (swedish), where the challenge is to optimize ones code to run as fast as possible. one of the parts in my code that caught my interest was some implode() calls. my gut feeling told me that it  for hashes, the merging process occurs on the keys: if the key does not already exist, it is added but if the key already exists, its value is overridden. tip. if you want to ensure that some values are defined in an array (by given default values), reverse the two elements in the call: 

php concatenate arrays

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the array_merge() function used to merge one ore more arrays. if the input arrays have matching string keys, then the later value will override it's previous counterpart. if the input arrays contain numeric keys, the later value will be appended instead of overriding the original value.

php concatenate arrays

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php concatenate arrays

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php concatenate arrays

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