这个页面上有很多直接或间接的答案，评论中也有一些很好的建议，但没有一个答案能代表我在自己的项目中所写的内容。

PHP转义序列\R文档:https://www.php.net/manual/en/regexp.reference.escape.php#:~:text=line%20break，\ R \n

代码:(演示)

$string = '
My text1

My text2


My text3


';

var_export(
    preg_split('/\R+/', $string, 0, PREG_SPLIT_NO_EMPTY)
);

输出:

array (
  0 => 'My text1',
  1 => 'My text2',
  2 => 'My text3',
)

OP没有提到从行中删除水平空白字符，因此不期望在变量(系统不可知)新行上爆炸时删除\s或\h。

虽然PHP_EOL是明智的建议，但当换行序列来自另一个操作系统时，它缺乏适当地爆炸字符串的灵活性。

使用非正则表达式爆炸往往不太直接，因为它需要字符串准备。此外，如果有多余的空白线需要清除，爆炸后可能会有清理工作。

Using \R+ (one or more consecutive newline sequences) and the PREG_SPLIT_NO_EMPTY function flag will deliver a gap-less, indexed array in a single, concise function call. Some people have a bias against regular expressions, but this is a perfect case for why regex should be used. If performance is a concern for valid reasons (e.g. you are processing hundreds of thousands of points of data), then go ahead and invest in benchmarking and micro-optimization. Beyond that, just use this one-line of code so that your code is brief, robust, and direct.

Use:

$str = "My text1\nMy text2\nMy text3";
$arr = explode("\n", $str);

foreach ($arr as $line_num => $line) {
    echo "Line #<b>{$line_num}</b>: " . htmlspecialchars($line) . "<br />\n";
}

真正的数组:

$str = "My text1\nMy text2\nMy text3";
$arr = explode("\n", $str);

$array = array();

foreach ($arr as $line) { // loop line by line and convert into array
    $array[] = $line;
};

print_r($array); // display all value

echo $array[1]; // display index 1

嵌入在线:

正文，html, iframe { 宽度:100%; 高度:100%; 溢出:隐藏; ｝ <iframe src="https://ideone.com/vE1gst" ></iframe>

我一直都很成功地使用这个方法:

$array = preg_split("/\r\n|\n|\r/", $string);

(更新为最后的\r，谢谢@LobsterMan)

这个方法对我来说总是有效的:

$uniquepattern = "gd$#%@&~#" // Any set of characters which you don’t expect to be present in user input $_POST['text']. Better use at least 32 characters.
$textarray = explode($uniquepattern, str_replace("\r", "", str_replace("\n", $uniquepattern, $_POST['text'])));

你可以使用爆炸函数，使用“\n”作为分隔符:

$your_array = explode("\n", $your_string_from_db);

例如，如果你有这样一段代码:

$str = "My text1\nMy text2\nMy text3";
$arr = explode("\n", $str);
var_dump($arr);

你会得到这样的输出:

array
  0 => string 'My text1' (length=8)
  1 => string 'My text2' (length=8)
  2 => string 'My text3' (length=8)

注意，必须使用双引号字符串，因此\n实际上被解释为换行符。 (详情请参阅手册页。)

我在PHP文档中找到了这个:

<?php
  // Split the phrase by any number of commas or space characters,
  // which include " ", \r, \t, \n and \f

  $keywords = preg_split("/[\s,]+/", "hypertext language, programming");
  print_r($keywords);
?>