PHP Sort array by field? [duplicate]

Question

Possible Duplicate:
how to sort a multidemensional array by an inner key
How to sort an array of arrays in php?

How can I sort an array like: $array[$i]['title'];

Array structure might be like:

array[0] (
  'id' => 321,
  'title' => 'Some Title',
  'slug' => 'some-title',
  'author' => 'Some Author',
  'author_slug' => 'some-author'
);

array[1] (
  'id' => 123,
  'title' => 'Another Title',
  'slug' => 'another-title',
  'author' => 'Another Author',
  'author_slug' => 'another-author'
);

So data is displayed in ASC order based off the title field in the array?

Michael: Tim was just being helpful. Searching first is a bit of a prerequisite here, and we get a lot of questioners that don't appear to have searched/tried first. — halfer
– halfer, Commented Apr 3, 2012 at 19:39

user229044 · Accepted Answer · 2012-04-03 19:28:39Z

160

Use usort which is built explicitly for this purpose.

function cmp($a, $b)
{
    return strcmp($a["title"], $b["title"]);
}

usort($array, "cmp");

answered Apr 3, 2012 at 19:28

user229044♦

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6 Comments

Kyle Crossman Over a year ago

You can multiply by -1 to reverse the sort as well, just an FYI to anyone who may need to do so.

Kessem Lee Over a year ago

Starting PHP 5.3 you can use anonymous functions, which is helpful especially if you're inside a class in a namespace: usort($domain_array, function ($a, $b) { return strcmp($a["name"], $b["name"]); });

stealthysnacks Over a year ago

Just to add on a bit to @GabiLee, if you want the search field to be dynamic based on some variable you already have set, try this: usort($domain_array, function ($a, $b) use ($searchField) { return strcmp($a[$searchField], $b[$searchField]); }); This might be useful for example on a web page where the user can choose a field to sort by.

Talha Imam Over a year ago

@KyleCrossman we can also pass the arguments in a different order to obtain a reverse sort.

pmiguelpinto90 Over a year ago

For php7.4 and up usort($array, fn($a, $b) => $a['title'] <=> $b['title']);

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