PHP排序函数,多维数组
下面的代码工作并产生一个多维数组,从最低气体比例值到最高气体比例值排序PHP排序函数,多维数组,php,sorting,Php,Sorting,下面的代码工作并产生一个多维数组,从最低气体比例值到最高气体比例值排序 usort($BMEnergyArray, function($a, $b) { return $a['gasproportion'] - $b['gasproportion']; }); 但是,我需要通过传递一个变量作为sort参数来调用这个函数,如下所示,它无法正确排序 $energyproportion = "'gasproportion'"; usort($
usort($BMEnergyArray, function($a, $b) {
return $a['gasproportion'] - $b['gasproportion'];
});
但是,我需要通过传递一个变量作为sort参数来调用这个函数,如下所示,它无法正确排序
$energyproportion = "'gasproportion'";
usort($BMEnergyArray, function($a, $b) {
return $a[$energyproportion] - $b[$energyproportion];
});
如何使用变量实现排序
数组中的每个项的结构如下所示:
Array ( [0] => Array ( [time] => 2018-11-01 01:40:00 [gas] => 13159 [coal] => 503 [nuclear] => 5822 [wind] => 2499 [hydro] => 263 [biomass] => 3024 [solar] => 0 [gasproportion] => 52 [coalproportion] => 2 [nuclearproportion] => 23 [windproportion] => 10 [hydroproportion] => 1 [biomassproportion] => 12 [solarproportion] => 0 )
您可以通过
函数()use()
语法授予它访问权限
$energyproportion = "gasproportion";
usort($BMEnergyArray, function($a, $b) use ($energyproportion) {
return $a[$energyproportion] - $b[$energyproportion];
});
您可以通过
函数()use()
语法授予它访问权限
$energyproportion = "gasproportion";
usort($BMEnergyArray, function($a, $b) use ($energyproportion) {
return $a[$energyproportion] - $b[$energyproportion];
});