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<code class="php"> $arr=[ ['id'=>1,'name'=>'php','num'=>3], ['id'=>2,'name'=>'js','num'=>1], ['id'=>1,'name'=>'php','num'=>2], ['id'=>3,'name'=>'python','num'=>2], ]; //怎么对id相同的对num求和并去重,返回的结果为 $arr=[ ['id'=>1,'name'=>'php','num'=>5], ['id'=>2,'name'=>'js','num'=>1], ['id'=>3,'name'=>'python','num'=>2], ];</code>
<code class="php"> $arr=[ ['id'=>1,'name'=>'php','num'=>3], ['id'=>2,'name'=>'js','num'=>1], ['id'=>1,'name'=>'php','num'=>2], ['id'=>3,'name'=>'python','num'=>2], ]; //怎么对id相同的对num求和并去重,返回的结果为 $arr=[ ['id'=>1,'name'=>'php','num'=>5], ['id'=>2,'name'=>'js','num'=>1], ['id'=>3,'name'=>'python','num'=>2], ];</code>
<code>$result = []; foreach ($arr as $v) { if (isset($result[$v['id']])) { $result[$v['id']]['num'] += $v['num']; } else { $result[$v['id']] = $v; } } print_r($result);</code>