[PHP_Day 5]_基本語法part5_迴圈while_do..while

PHP迴圈

while

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<?php $count = 5; while($count !=0){ echo "<h1>My Test</h1>"; echo "Count: ".$count."<br/>"; $count--; } ?>

Array遍歷(倒序)

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<?php $arr = ["blue","green","yello","white"]; $count = count($arr); echo $count."<br/>"; while($count--){ echo $arr[$count]."<br/>"; } ?>

Array遍歷(正序)

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<?php $arr = ["blue","green","yello","white"]; $count = count($arr); $idx = 0; echo $count."<br/>"; while($count--){ echo $arr[$idx]."<br/>"; $idx++; } ?>

do ... while

do裡面會先做 while裡面要改成先減減不然會offset

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<?php $arr = ["blue","green","yello","white"]; $count = count($arr); $idx = 0; echo $count."<br/>"; do{ echo $arr[$idx]."<br/>"; $idx++; }while(--$count) ?>