How to extract first element of each array into array PHP

Question

Sometimes when you are performing db queries, you might need only the first element of the arrays whereas PHP result array will give you an array of arrays containing one element each. What is the best way to extract each element into an array e.g.

Say you have array(array('silas'), array('douglas'))

but you need array('silas', 'douglas');

There is a userland implementation of array_column() that will work with versions of PHP prior to 5.5 — Mark Baker
– Mark Baker, Commented Nov 22, 2013 at 10:23

Chibueze Opata · Accepted Answer · 2013-11-22 10:23:22Z

3

You can use array_map('array_shift', $your_array);

answered Nov 22, 2013 at 10:23

Chibueze Opata

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4 Comments

baldrs Over a year ago

Note that array_map is slower than foreach($your_array as $elem) { $new_array[] = array_shift($elem); }

Mark Baker Over a year ago

array_column() is significantly faster than either, if it's available to use

Chibueze Opata Over a year ago

Yeah, I've learnt that too now, but PHP 5.5+ is a bit futuristic.

Mark Baker Over a year ago

Timings on an array with 256k elements: array_column time = 0.021726 s; array_map time = 0.241532 s; foreach time = 0.174203 s

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