[筆記] Codecademy Learn PHP – 13

Posted on2020-11-082020-10-30AuthorANDY LIEN

章節連結

課程相關資訊
內容

Demo

相關文章

筆記下 PHP 的迴圈使用相關介紹。

課程相關資訊

[連結]：https://www.codecademy.com/learn/learn-php

本篇範圍：Chapter 8 ( Loops in PHP ) ，一共有 10 篇

請注意：本系列文章為個人對應課程的消化吸收後，所整理出來的內容。換言之，並不一定會包含全部的課程內容，也有可能會添加其他資源來說明。

內容

1. foreach 取 array 的時候，可以一口氣取出 key 和 value 兩個參數
2. do…while 的結尾，其中 while 要加上 ;

Demo

<?php
# while
$count = 5;
echo "Countdown!\n";
while ($count > -1) {
  echo $count . "\n";
  $count--;
}
echo "Blastoff!\n\n";

# do...while
$lights = "off";
do {
  echo "The lights are " . $lights . "\n";
  if ($lights === "off") {
    $lights = "on";
  } else {
    $lights = "off";
  }
} while ($lights === "on");
echo "\n";

# for
$names = ["Ann", "Bob", "Cassidy", "Dave", "Ed"];
for ($index = 0; $index < count($names); $index+=2){
  echo $names[$index] . "\n";
}
echo "\n";

# foreach
$properties = [
  "temperature" => "cold",
  "weather" => "rainy",
  "sky" => "gray"
              ];
foreach ($properties as $key=>$value) {
  echo "The $key is $value.\n";
}
echo "\n";

# break and continue
# this skips printing Ann and will
# stop execution after printing
# Dave
$names = ["Ann", "Bob", "Cassidy", "Dave", "Ed"];
for ($index = 0; $index < count($names); $index+=1){
  if ($names[$index] == "Ann") {
    continue;
  }
  echo $names[$index] . "\n";
  if ($names[$index] == "Dave") {
    break;
  }
}

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<?php

# while

$count = 5;

echo "Countdown!\n";

while ($count > -1) {

echo $count . "\n";

$count--;

}

echo "Blastoff!\n\n";

# do...while

$lights = "off";

do {

echo "The lights are " . $lights . "\n";

if ($lights === "off") {

$lights = "on";

} else {

$lights = "off";

}

} while ($lights === "on");

echo "\n";

# for

$names = ["Ann", "Bob", "Cassidy", "Dave", "Ed"];

for ($index = 0; $index < count($names); $index+=2){

echo $names[$index] . "\n";

}

echo "\n";

# foreach

$properties = [

"temperature" => "cold",

"weather" => "rainy",

"sky" => "gray"

];

foreach ($properties as $key=>$value) {

echo "The $key is $value.\n";

}

echo "\n";

# break and continue

# this skips printing Ann and will

# stop execution after printing

# Dave

$names = ["Ann", "Bob", "Cassidy", "Dave", "Ed"];

for ($index = 0; $index < count($names); $index+=1){

if ($names[$index] == "Ann") {

continue;

}

echo $names[$index] . "\n";

if ($names[$index] == "Dave") {

break;

}

}

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