PHP strcmp function in usort not sorting alphabetically

https://stackoverflow.com/questions/17836518

04-06-2022
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Question

I have this script

$todos=array(
    '0' => array('id' => 46, 'nombre' => 'b2 miami downtown','precio' => 149.01,'tipo' => 'expedia'),
    '1' => array('id' => 242,'nombre' => 'b2 Miami Downtown','precio' => 176.98,'tipo' => 'hotelbeds'),
    '2' => array('id' => 240,'nombre' => 'b2 Miami Downtown','precio' => 131.62,'tipo' => 'hotelbeds'),
    '3' => array('id' => 241,'nombre' => 'b2 Miami Downtown','precio' => 131.62,'tipo' => 'hotelbeds'),
    '4' => array( 'id' => 178,'nombre' => 'Z Ocean Hotel South Beach','precio' => 400.93,'tipo' => 'expedia'),
    '5' => array( 'id' => 254,'nombre' => 'Whitelaw Hotel','precio' => 142.29,'tipo' => 'hotelbeds'),
    '6' => array( 'id' => 124, 'nombre' => 'Whitelaw Hotel','precio' => 132.04,'tipo' => 'tourico'),
    '7' => array( 'id' => 62, 'nombre' => 'Westin Colonnade Coral Gables','precio' => 138.39,'tipo' => 'tourico'),
    '8' => array( 'id' => 275, 'nombre' => 'Westgate South Beach','precio' => 166.79,'tipo' => 'hotelbeds'),
    '9' => array( 'id' => 44, 'nombre' => 'W South Beach','precio' => 374.55,'tipo' => 'tourico'),
    '10' => array( 'id' => 206, 'nombre' => 'Holiday Inn Express West Doral Miami Airport','precio' => 103.22,'tipo' => 'hotelbeds'),
    '11' => array( 'id' => 117, 'nombre' => 'Holiday Inn Express Miami International Airport','precio' => 106.3,'tipo' => 'expedia'),
    '12' => array( 'id' => 114, 'nombre' => 'Holiday Inn Express Miami Airport Doral Area','precio' => 113,'tipo' => 'tourico'),
    '13' => array( 'id' => 78, 'nombre' => 'Holiday Inn Express Doral','precio' => 93.36,'tipo' => 'expedia'),
    '14' => array( 'id' => 62, 'nombre' => 'Holiday Inn Express & Suites Kendall East Miami','precio' => 128.46,'tipo' => 'expedia'),
    '15' => array( 'id' => 18, 'nombre' => 'Best Western Plus Kendall Hotel & Suites','precio' => 429.55,'tipo' => 'tourico'),
    '16' => array( 'id' => 19, 'nombre' => 'Best Western Plus Kendall Hotel & Suites','precio' => 429.55,'tipo' => 'expedia'),
    '17' => array( 'id' => 120, 'nombre' => 'Best Western Kendall Hotel & Suites','precio' => 114.27,'tipo' => 'expedia'),
    '18' => array( 'id' => 69, 'nombre' => 'Holiday Inn Express & Suites Kendall','precio' => 126.5,'tipo' => 'expedia'));

    echo "<pre>";
    print_r($todos);

    function comp($a,$b){
        if(soundex($a['nombre'])==soundex($b['nombre'])) return($a['precio']-$b['precio']);
        if(soundex($a['nombre'])!=soundex($b['nombre'])) return strcmp($a['nombre'], $b['nombre']);
    }
    usort($todos,'comp');
    print_r($todos);
    echo "<pre>";

I need to sort the array, first by hotel name, and after that each hotel by price (precio). The reason to use soundex, is because the same hotel may have a diferent name depending on the provider (proveedor), so I need to agroup the hotels, and put first the lowest price, to delete the others so I can offer only the best price.

The output:

THE SORTED ARRAY

As you see "b2 Miami Downtown" should be in the top of the array not last.

Please help with this.

Thanks!!!.

Solution

From the PHP manual for strcmp:

Note that this comparison is case sensitive.

Letters A-Z come before letters a-z. Try strcasecmp instead.

EDIT: even if using strcasecmp, be aware that its case-insensitiveness only really applies to the English charset. If you use names in other locales (Spanish, French, German, you name it), those non-basic-ASCII characters will still be compared in a binary way. E.g.,

posada el Ñandú rengo is not equivalent to posada el ñandÚ rengo.

You may want to use multibyte string functions such as mb_convert_case or mb_strtolower before comparing.

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