循环遍历数据数组并打印一个“递增”字母

$letters = range('a','z');

使用 range 功能:

$letters = range('a', 'z');
print_r($letters);

foreach 循环分别处理每个字母:

foreach($letters as $letter) {
    echo $letter . '<br />';
}

作为一个示范(我知道你已经接受了答案),但有时知道你也可以增加字符变量是很有用的:

$var = 'a';
do {
   echo $var++.'<br />';
} while ($var != 'aa');

你的意思是有这样的东西吗?

foreach(range('a','z') as $value)
{
  echo $value . ","
}

for ($counter = ord('a'); $counter <= ord('z'); $counter += 1) {
    echo chr($counter) . " - $counter";
}

增量运算符的简单用法:

<?php
$array = array("cat","car","far","tar","tag");

  // No need for an array, just set $letter to "a", then increment it.
$letter = "a";

foreach($array as $value) {
      // Print your letter, then increment it.
    echo $letter++ . " - $value\n";
}
?>

Look at it live.

优势 使用此方法而不是创建数组 ,因为你刚换成了两个字母: like this .

如果使用 $key => $value foreach循环的功能:

$letters = range('a', 'z');

foreach($letters as $key => $value)
{
    echo $key . '=>' . $value;
}

你甚至可以简单地做到:

foreach(range('a', 'z') as $key => $value)
{
    echo $key . '=>' . $value;
}

为了好玩。。。

$array = array(11, 33, 44, 98, 1, 3, 2, 9, 66, 21, 45);
$new_array = array_combine(array_slice(range('a','z'),0,count($array)),$array);
    foreach($new_array as $k=>$v){
        echo "$k - $v";
    }