Question

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How to write to the first element of an array?

I know reset can return the first element... but you can not use it to write to it.

flag	asked Feb 19 at 15:11 Mark 827●7 88% accept rate

	sorry I was not clear... the array is not numeric... e.g $test['element_1'] – Mark Feb 19 at 15:15
	Same questions: stackoverflow.com/questions/2230154/… and stackoverflow.com/questions/2236720/… – Gordon Feb 19 at 15:31
	The first question is similar... but its about accessing an array and not writing to it... the second is a completely different question... – Mark Feb 19 at 15:34

Select0r · Answer 1 · 2010-02-19 15:18:25Z

Anything wrong with $yourarray[0] = $value ?

If you don't want to overwrite the first element, try "array_unshift":

http://www.php.net/manual/en/function.array-unshift.php

EDIT: ok, use this for non-numerical keys:

reset($yourarray);
$key = key($yourarray);
$yourarray[$key] = $newvalue;

Alex Mcp · Answer 2 · 2010-02-19 15:19:41Z

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That's called an "associative array" or a "hash". Technically, it doesn't have an order. You may have an item that you've put in first, but that's only incidental.

answered Feb 19 at 15:19

Alex Mcp
2,162●4●15

vicatcu · Answer 3 · 2010-02-19 15:12:53Z

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does this work?

reset($x);
$x[0] = $value;

answered Feb 19 at 15:12

vicatcu
1,037●8

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The reset isn't actually needed to set the first element. – Neil Aitken Feb 19 at 15:15

Greg K · Answer 4 · 2010-02-19 15:17:09Z

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Do you mean prepend the array with a value?

array_unshift() - this is costly, rebuilding the array.

answered Feb 19 at 15:17

Greg K
256●9

PHP - write to first element of an array

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