Comments on: Sorting 2D-arrays in PHP - anectodes and reflections http://www.prodevtips.com/2008/01/06/sorting-2d-arrays-in-php-anectodes-and-reflections/ Dev related notes, tutorials and anecdotes Tue, 07 Oct 2008 09:09:24 +0000 http://wordpress.org/?v=2.3.3 By: Henrik http://www.prodevtips.com/2008/01/06/sorting-2d-arrays-in-php-anectodes-and-reflections/#comment-380 Henrik Wed, 09 Jan 2008 02:54:38 +0000 http://www.prodevtips.com/2008/01/06/sorting-2d-arrays-in-php-anectodes-and-reflections/#comment-380 Leonard: That lib is one of my earlier creations, working but ugly "legacy" code that shows up now and then in my projects because I'm too lazy to prettify it. I don't want people to get the wrong ideas by showing it. But basically what it does in the above example is checking if the string is a date with a simple regular expression and you really have to know how it works because it might capture stuff that is not a date (quick, sloppy implementation that worked for the original project). The date compare function just converts the dates to timestamps (with strtodate) and compares them as numbers instead. Leonard: That lib is one of my earlier creations, working but ugly “legacy” code that shows up now and then in my projects because I’m too lazy to prettify it. I don’t want people to get the wrong ideas by showing it. But basically what it does in the above example is checking if the string is a date with a simple regular expression and you really have to know how it works because it might capture stuff that is not a date (quick, sloppy implementation that worked for the original project).

The date compare function just converts the dates to timestamps (with strtodate) and compares them as numbers instead.

]]> By: Henrik http://www.prodevtips.com/2008/01/06/sorting-2d-arrays-in-php-anectodes-and-reflections/#comment-1538 Henrik Wed, 09 Jan 2008 02:54:38 +0000 http://www.prodevtips.com/2008/01/06/sorting-2d-arrays-in-php-anectodes-and-reflections/#comment-1538 Leonard: That lib is one of my earlier creations, working but ugly "legacy" code that shows up now and then in my projects because I'm too lazy to prettify it. I don't want people to get the wrong ideas by showing it. But basically what it does in the above example is checking if the string is a date with a simple regular expression and you really have to know how it works because it might capture stuff that is not a date (quick, sloppy implementation that worked for the original project).<br><br>The date compare function just converts the dates to timestamps (with strtodate) and compares them as numbers instead. Leonard: That lib is one of my earlier creations, working but ugly “legacy” code that shows up now and then in my projects because I'm too lazy to prettify it. I don't want people to get the wrong ideas by showing it. But basically what it does in the above example is checking if the string is a date with a simple regular expression and you really have to know how it works because it might capture stuff that is not a date (quick, sloppy implementation that worked for the original project).

The date compare function just converts the dates to timestamps (with strtodate) and compares them as numbers instead.

]]> By: René Leonhardt http://www.prodevtips.com/2008/01/06/sorting-2d-arrays-in-php-anectodes-and-reflections/#comment-376 René Leonhardt Tue, 08 Jan 2008 14:37:58 +0000 http://www.prodevtips.com/2008/01/06/sorting-2d-arrays-in-php-anectodes-and-reflections/#comment-376 Where can the implementaiton of class StringManip be found? Where can the implementaiton of class StringManip be found?

]]> By: René Leonhardt http://www.prodevtips.com/2008/01/06/sorting-2d-arrays-in-php-anectodes-and-reflections/#comment-1149 René Leonhardt Tue, 08 Jan 2008 14:37:58 +0000 http://www.prodevtips.com/2008/01/06/sorting-2d-arrays-in-php-anectodes-and-reflections/#comment-1149 Where can the implementaiton of class StringManip be found? Where can the implementaiton of class StringManip be found?

]]> By: developercast.com » ProDevTips: Sorting 2D-arrays in PHP - anectodes and reflections http://www.prodevtips.com/2008/01/06/sorting-2d-arrays-in-php-anectodes-and-reflections/#comment-359 developercast.com » ProDevTips: Sorting 2D-arrays in PHP - anectodes and reflections Mon, 07 Jan 2008 15:39:39 +0000 http://www.prodevtips.com/2008/01/06/sorting-2d-arrays-in-php-anectodes-and-reflections/#comment-359 [...] the ProDevTips website today, there’s a new article looking at the sorting of arrays, specifically of the two- and three-dimensional sort. One of the [...] […] the ProDevTips website today, there’s a new article looking at the sorting of arrays, specifically of the two- and three-dimensional sort. One of the […]

]]> By: PHPDeveloper.org http://www.prodevtips.com/2008/01/06/sorting-2d-arrays-in-php-anectodes-and-reflections/#comment-358 PHPDeveloper.org Mon, 07 Jan 2008 13:57:20 +0000 http://www.prodevtips.com/2008/01/06/sorting-2d-arrays-in-php-anectodes-and-reflections/#comment-358 <strong>ProDevTips: Sorting 2D-arrays in PHP - anectodes and reflections...</strong> On the ProDevTips website today, there's a new article looking at ...... ProDevTips: Sorting 2D-arrays in PHP - anectodes and reflections…

On the ProDevTips website today, there’s a new article looking at ……

]]> By: Henrik http://www.prodevtips.com/2008/01/06/sorting-2d-arrays-in-php-anectodes-and-reflections/#comment-357 Henrik Mon, 07 Jan 2008 08:44:28 +0000 http://www.prodevtips.com/2008/01/06/sorting-2d-arrays-in-php-anectodes-and-reflections/#comment-357 However the uasort function can come in handy to implement custom object sorting a la Java implements sortable. However the uasort function can come in handy to implement custom object sorting a la Java implements sortable.

]]> By: Henrik http://www.prodevtips.com/2008/01/06/sorting-2d-arrays-in-php-anectodes-and-reflections/#comment-1148 Henrik Mon, 07 Jan 2008 08:44:28 +0000 http://www.prodevtips.com/2008/01/06/sorting-2d-arrays-in-php-anectodes-and-reflections/#comment-1148 However the uasort function can come in handy to implement custom object sorting a la Java implements sortable. However the uasort function can come in handy to implement custom object sorting a la Java implements sortable.

]]> By: Henrik http://www.prodevtips.com/2008/01/06/sorting-2d-arrays-in-php-anectodes-and-reflections/#comment-356 Henrik Mon, 07 Jan 2008 08:41:47 +0000 http://www.prodevtips.com/2008/01/06/sorting-2d-arrays-in-php-anectodes-and-reflections/#comment-356 I ended up discarding Andy's way of doing things. I couldn't figure out how to make it work with arbitrary keys and/or in a static function setting. I ended up using array_multisort anyway: <pre><code class="php"> static function sort2DAsc(&$arr, $key){ $sort_col = array(); foreach ($arr as $sub) $sort_col[] = $sub[$key]; if(is_numeric($sort_col[0])) array_multisort($sort_col, SORT_NUMERIC, $arr); else if(is_string($sort_col[0])){ $sort_col = array_map('strtolower', $sort_col); array_multisort($sort_col, SORT_STRING, $arr); } } static function sort2DDesc(&$arr, $key){ $sort_col = array(); foreach ($arr as $sub) $sort_col[] = $sub[$key]; if(is_numeric($sort_col[0])) array_multisort($sort_col, SORT_NUMERIC, SORT_DESC, $arr); else if(is_string($sort_col[0])){ $sort_col = array_map('strtolower', $sort_col); array_multisort($sort_col, SORT_STRING, SORT_DESC, $arr); } } </code></pre> Multisort is case sensitive and that is not the behavior I want so in addition to creating the whole sort column on the fly we also need to make it all lower case. It's not so beautiful anymore but it works and it is still shorter than the original monster(s). I ended up discarding Andy’s way of doing things. I couldn’t figure out how to make it work with arbitrary keys and/or in a static function setting.

I ended up using array_multisort anyway:

static function sort2DAsc(&$arr, $key){
	$sort_col = array(); 
	foreach ($arr as $sub) $sort_col[] = $sub[$key];
	if(is_numeric($sort_col[0]))
		array_multisort($sort_col, SORT_NUMERIC, $arr);
	else if(is_string($sort_col[0])){
		$sort_col = array_map('strtolower', $sort_col);
		array_multisort($sort_col, SORT_STRING, $arr);
	}
}

static function sort2DDesc(&$arr, $key){
	$sort_col = array();
	foreach ($arr as $sub) $sort_col[] = $sub[$key];
	if(is_numeric($sort_col[0]))
		array_multisort($sort_col, SORT_NUMERIC, SORT_DESC, $arr);
	else if(is_string($sort_col[0])){
		$sort_col = array_map('strtolower', $sort_col);
		array_multisort($sort_col, SORT_STRING, SORT_DESC, $arr);
	}
}

Multisort is case sensitive and that is not the behavior I want so in addition to creating the whole sort column on the fly we also need to make it all lower case. It’s not so beautiful anymore but it works and it is still shorter than the original monster(s).

]]> By: Henrik http://www.prodevtips.com/2008/01/06/sorting-2d-arrays-in-php-anectodes-and-reflections/#comment-352 Henrik Mon, 07 Jan 2008 03:05:13 +0000 http://www.prodevtips.com/2008/01/06/sorting-2d-arrays-in-php-anectodes-and-reflections/#comment-352 Even better, thanks Andy! I remember this way of doing things from Java, nice that it will work in PHP too. I didn't even know these u* functions existed! Even better, thanks Andy! I remember this way of doing things from Java, nice that it will work in PHP too. I didn’t even know these u* functions existed!

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