将文件加载到数组中并使用in_array进行检查

Question

I want to check if a value exists in an array made from a text file. This is what I've got so far:

<?php
$array = file($_SERVER['DOCUMENT_ROOT'].'/textfile.txt');
if(in_array('value',$array)){
   echo 'value exists';
}
?>

I've experimented a little with foreach-loops as well, but couldn't find a way to do what I want.. The values in the text document are separated by new lines.

Answer 1

This happens because the lines of the file that become array values have a trailing newline. You need to use the FILE_IGNORE_NEW_LINES option of file to get your code working as:

$array = file($_SERVER['DOCUMENT_ROOT'].'/textfile.txt',FILE_IGNORE_NEW_LINES);

EDIT:

You can use var_dump($array) and see that the lines have a newline at the end.