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php - 尝试在 PHP 中对关联数组进行排序

问题描述

我正在尝试在 PHP 中对这个关联数组进行排序，按字段排序name

$fonts = array(
    0 => ["index" => 0, "name" => "Arial", "path" => "assets/fonts/arial.ttf"],
    1 => ["index" => 1, "name" => "Times", "path" => "assets/fonts/times.ttf"],
    2 => ["index" => 2, "name" => "Roboto", "path" => "assets/fonts/roboto.ttf"],
    3 => ["index" => 3, "name" => "AlexBrush", "path" => "assets/fonts/AlexBrush-Regular.ttf"],
);

我想要做的是按名称对条目进行排序，但保持与条目本身关联的键，所以我想要的是：

 $fonts = array(
    3 => ["index" => 3, "name" => "AlexBrush", "path" => "assets/fonts/AlexBrush-Regular.ttf"],
    0 => ["index" => 0, "name" => "Arial", "path" => "assets/fonts/arial.ttf"],
    2 => ["index" => 2, "name" => "Roboto", "path" => "assets/fonts/roboto.ttf"],
    1 => ["index" => 1, "name" => "Times", "path" => "assets/fonts/times.ttf"],
);

这是暴露问题的最少代码（PHP ver +7）：

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

$fonts = array(
    0 => ["index" => 0, "name" => "Arial", "path" => "assets/fonts/arial.ttf"],
    1 => ["index" => 1, "name" => "Times", "path" => "assets/fonts/times.ttf"],
    2 => ["index" => 2, "name" => "Roboto", "path" => "assets/fonts/roboto.ttf"],
    3 => ["index" => 3, "name" => "AlexBrush", "path" => "assets/fonts/AlexBrush-Regular.ttf"],
);

uasort($fonts, "cmp");

for($i = 0; $i < 4; $i++)
{
    echo "<br/>".$fonts[$i]["name"];
}

我正在使用uasort()它，因为它应该在对数组进行排序时保持键的关联。不幸的是，如果我打印数组，我会得到相同的顺序，即：

Arial
Times
Roboto
AlexBrush

标签： phparrayssortingassociative-array

解决方案

像这样sort按名称执行并循环使用foreach()

<?php

$fonts = array(
    0 => ["index" => 0, "name" => "Arial", "path" => "assets/fonts/arial.ttf"],
    1 => ["index" => 1, "name" => "Times", "path" => "assets/fonts/times.ttf"],
    2 => ["index" => 2, "name" => "Roboto", "path" => "assets/fonts/roboto.ttf"],
    3 => ["index" => 3, "name" => "AlexBrush", "path" => "assets/fonts/AlexBrush-Regular.ttf"],
);

uasort($fonts, function($a, $b) {
    return strcmp($a['name'], $b['name']);
});

print_r($fonts);

foreach($fonts as $font){
 echo $font["name"].PHP_EOL;
}

?>

编辑：根据OP的评论，

 $indexed_array = array_column($fonts,'name','index'); // array column map name by index
 print_r($indexed_array); 
 echo $indexed_array[3];

演示： https ://3v4l.org/W7BOH

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