| 方式有哪些？ 方式一： range() 函数 //常用于一维数组
<?php
// array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
foreach (range(0, 12) as $number) {
echo $number;
}
// step 参数
// array(0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100)
foreach (range(0, 100, 10) as $number) {
echo $number;
}
// 字符序列的使用
// array('a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i');
foreach (range('a', 'i') as $letter) {
echo $letter;
}
// array('c', 'b', 'a');
foreach (range('c', 'a') as $letter) {
echo $letter;
}
?>
详细见：https://www.php.net/manual/zh/function.range.php 方式二：//推荐 <?php //目标: 构造一个m列n维数组
//思路: function constructArray($m, $n)
{
$array = [];
for($i = 0; $i < $m; $i++){
for($j = 0; $j < $n; $j++){
$element = '';
$num = rand(1,4);
for($k = 0; $k < $num; $k++){
$element .= chr(rand(97, 122));
//echo $element;
//echo "<br>";
//97~122是小写的英文字母
//65~90是大写的
}
$array[$i][$j] = $element;
}
}
return $array;
} //打印
$dump = function ($var){
echo '<pre>'; // This is for correct handling of newlines
ob_start();
var_dump($var);
$a=ob_get_contents();
ob_end_clean();
echo htmlspecialchars($a,ENT_QUOTES); // Escape every HTML special chars (especially > and < )
echo '</pre>';
}; $data = constructArray(6, 5);
$dump($data); 打印结果： 
后续补充 ... |
