如何在读取文件时删除跳过空行

Question

reading the official manual , if I want to skip empty line in a txt I just need to call the function file() with FILE_SKIP_EMPTY_LINES; in fact I wrote :

$fileArray=file($uploadDirectory.$tracklistFile_name, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);

but It also read empty line. So, in a text like this :

// START OF THE DOCUMENT
aaa
bbb

ccc
ddd

// END OF THE DOCUMENT

in fact sizeof($fileArray) is 6 : it adds the empty lines between bbb and ccc , and the last one. Why?

Answer 1

FILE_SKIP_EMPTY_LINES really only skips empty lines. If you have spaces or tabs or other whitespace in it, file() will not consider it an empty line.

It doesn't do a trim before checking, it looks if $line=="\\n" and only then considers it an empty line.

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As alternative you could use:

$file = array_filter(array_map("trim", file("text.txt")), "strlen");

Answer 2

有很多方法可以清理阵列，但我喜欢这个：

$fileArray = array_values(array_filter($fileArray, "trim"));