<?php //1.for()循环 $data=[1,2,3,4,5,6,7,8,9,10]; $res=0; for($i=0;$i<10;$i++){ $res +=$data[$i]; } echo $res; echo '<hr>'; //2.while()循环 $j=0; while ($j<10) { $res +=$data[$j]; $j++; } echo $res; echo '<hr>'; //3.do{}while()循环 $i=0; do{ $res +=$data[$i]; $i++; }while ($i<10); echo $res; echo '<hr>'; //4.foreach()循环遍历数组 $min=1; $max=20; $data=range($min, $max); foreach ($data as $k => $v) { echo $k.'===>'.$v.'<br>'; }