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Full Discussion: comparing variables
Top Forums UNIX for Dummies Questions & Answers comparing variables Post 302337992 by TonyFullerMalv on Sunday 26th of July 2009 08:03:58 PM
Old 07-26-2009
I've been caught out this before but -eq is only for comparing integers, extract from test(1) manpage:
Code:
 INTEGER1 -eq INTEGER2
              INTEGER1 is equal to INTEGER2

 

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USORT(3)								 1								  USORT(3)

usort - Sort an array by values using a user-defined comparison function

SYNOPSIS
bool usort (array &$array, callable $value_compare_func) DESCRIPTION
This function will sort an array by its values using a user-supplied comparison function. If the array you wish to sort needs to be sorted by some non-trivial criteria, you should use this function. Note If two members compare as equal, their relative order in the sorted array is undefined. Note This function assigns new keys to the elements in $array. It will remove any existing keys that may have been assigned, rather than just reordering the keys. PARAMETERS
o $array - The input array. o $value_compare_func - The comparison function must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second. int callback (mixed $a, mixed $b) Caution Returning non-integer values from the comparison function, such as float, will result in an internal cast to integer of the callback's return value. So values such as 0.99 and 0.1 will both be cast to an integer value of 0, which will compare such values as equal. RETURN VALUES
Returns TRUE on success or FALSE on failure. EXAMPLES
Example #1 usort(3) example <?php function cmp($a, $b) { if ($a == $b) { return 0; } return ($a < $b) ? -1 : 1; } $a = array(3, 2, 5, 6, 1); usort($a, "cmp"); foreach ($a as $key => $value) { echo "$key: $value "; } ?> The above example will output: 0: 1 1: 2 2: 3 3: 5 4: 6 Note Obviously in this trivial case the sort(3) function would be more appropriate. Example #2 usort(3) example using multi-dimensional array <?php function cmp($a, $b) { return strcmp($a["fruit"], $b["fruit"]); } $fruits[0]["fruit"] = "lemons"; $fruits[1]["fruit"] = "apples"; $fruits[2]["fruit"] = "grapes"; usort($fruits, "cmp"); while (list($key, $value) = each($fruits)) { echo "$fruits[$key]: " . $value["fruit"] . " "; } ?> When sorting a multi-dimensional array, $a and $b contain references to the first index of the array. The above example will output: $fruits[0]: apples $fruits[1]: grapes $fruits[2]: lemons Example #3 usort(3) example using a member function of an object <?php class TestObj { var $name; function TestObj($name) { $this->name = $name; } /* This is the static comparing function: */ static function cmp_obj($a, $b) { $al = strtolower($a->name); $bl = strtolower($b->name); if ($al == $bl) { return 0; } return ($al > $bl) ? +1 : -1; } } $a[] = new TestObj("c"); $a[] = new TestObj("b"); $a[] = new TestObj("d"); usort($a, array("TestObj", "cmp_obj")); foreach ($a as $item) { echo $item->name . " "; } ?> The above example will output: b c d Example #4 usort(3) example using a closure to sort a multi-dimensional array <?php $array[0] = array('key_a' => 'z', 'key_b' => 'c'); $array[1] = array('key_a' => 'x', 'key_b' => 'b'); $array[2] = array('key_a' => 'y', 'key_b' => 'a'); function build_sorter($key) { return function ($a, $b) use ($key) { return strnatcmp($a[$key], $b[$key]); }; } usort($array, build_sorter('key_b')); foreach ($array as $item) { echo $item['key_a'] . ', ' . $item['key_b'] . " "; } ?> The above example will output: y, a x, b z, c SEE ALSO
uasort(3), The comparison of array sorting functions. PHP Documentation Group USORT(3)
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