Php strpos 在搜索文件时无法正常工作

Question

I have a php file that will search all the files on my server for any files that contains a string. If i hard code the search term in the strpos() it works fine. but if i try to use a $string it wont work

works:
$file = file_get_contents($dir);
if(strpos($file,  'find me')) 

does not work:
$findme='find me';
$file = file_get_contents($dir);
if(strpos($file,  $findme)) 

any ideas?

edit: if(strpos($file, 'find me').== false) does not make it work.

resolved: find me must be in tics if(strpos($file, '$findme'))

Answer 1

you should be testing if(strpos($file, 'find me') !== false) , because strpos($file, 'find me') could be 0 if the file starts with "find me"

Answer 2

Well, the first thing that leaps out at me is that you're using strpos incorrectly; you need to do if(strpos($file, 'find me') !== false) and if(strpos($file, $findme) !== false) .

Answer 3

The warning in the docs mention you should look for an explicit false and not just place the function in a condition. Because strpos could potentially return 0 or "" (which both evaluate to false) the condition itself could fail.

Try the following instead:

if(strpos($file,$findme) !== false)

Also, if you're saying you've tried this and it's still failing, try running a var_dump($file) to make sure the haystack does indeed contain information that can be searched through.