检查文件最后一行下方是否有内容 - check if there is something below the last line of a file

check if there is something below the last line of a file

>我需要检查最后一行下面是否有东西。（如果可以将光标放在其下方，则它应该匹配。

This is the first line
This is the last line
|

注意：This is the last line下面的|表示最后一行下方有一行空行，因此您可以将光标放在最后一行下方。

我怎样才能检测到这一点？我用preg_match试过了，但是使用linux命令的解决方案也可以。

https://regex101.com/r/mY9wQ3/2

这是一个带有正则表达式的解决方案：
它会检查文本缓冲区末尾的 2 个连续 EOL，在所有可能的变体中。

法典

<?php
// The function ----------------------------------------------------------
function hasEOLatEnd($text) {
    return (preg_match('/.*?('r'n|'n'r|'r|'n){2,2}$/s', $text));
} 
// -----------------------------------------------------------------------
// Tests -----------------------------------------------------------------
$text_1 = "This a one line - without EOL";
$text_2 = "This is one line - with EOL
";
$text_3 = "These are two lines - 
without EOL";
$text_4 = "These are two lines - 
with EOL
";
echo '$text_1 has ' . (hasEOLatEnd($text_1) ? 'EOL' : 'NO EOL') . ' at the end<br />';
echo '$text_2 has ' . (hasEOLatEnd($text_2) ? 'EOL' : 'NO EOL') . ' at the end<br />';
echo '$text_3 has ' . (hasEOLatEnd($text_3) ? 'EOL' : 'NO EOL') . ' at the end<br />';
echo '$text_4 has ' . (hasEOLatEnd($text_4) ? 'EOL' : 'NO EOL') . ' at the end<br />';
// ----------------------------------------------------------------------
?>

结果

$text_1 has NO EOL at the end
$text_2 has EOL at the end
$text_3 has NO EOL at the end
$text_4 has EOL at the end

Do tail -n1 <filename> | grep '^$' -- 如果文件的最后一行为空，这将返回 0。

function no_space_after($str){
     return (trim($str) == $str);
}