Sorting a Multidimensional Array by a Specified Column in PHP

To sort a multidimensional array in PHP by a specific column, use the built-in PHP functions usort or uasort. The key to sorting is to provide a custom comparison function that determines the order of the array elements.

Custom Comparison Function for Sorting

The custom comparison function takes two elements of the array as input and returns an integer:

• A positive integer if the first element is considered "greater" than the第二。如果将第一个元素视为“比第二个较少”，则为负整数。
零，如果元素被视为平等。
均等。每个元素代表具有多个列的记录。要按
• '名称'
列对数组进行排序，请使用以下代码：

此自定义比较函数使用'name' column.

Sorting by Multiple ColumnsTo sort by multiple columns, pass additional parameters to the custom comparison function.例如，按

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

usort（$ data，function，function（$ a，$ b）{ if（$ a ['number'] == $ b ['number']）{ 返回strcmp（$ a ['name']，$ b ['name']）; } 返回$ a ['number'] - $ b ['number']; }）; 高级功能您还可以指定以下高级功能： set and sater_des_descc 顺序。自定义投影：