PHP Remove line containing string from a text file

Question

I have a file that looks something like this.

Kate
Johnny
Bill
Kermit

I want to be able to put, for example, "Bill" into a string, and remove "Bill", or whatever is in the variable, and the subsequent "\r\n" from the file. The variable will always contain something that is already in the file, there won't be "George" if there is no George.
This code checks if "Bill" is in file.

$fileContents = file_get_contents("names.txt");
if(strpos($fileContents, "Bill"))
{
    //Bill is here!
}

How would I expand upon this to remove "Bill\r\n"? Thanks in advance!

strpos() can return a 0 if the position is the first-character of the line, so your if statement fails. Try if (strpos($fileContents, "Bill") !== false) { instead. — newfurniturey
– newfurniturey, Commented Oct 4, 2012 at 3:13

Adam Plocher · Accepted Answer · 2012-10-04 03:12:15Z

2

$var = "Bill";
$input = "Kate
Johnny
Bill
Kermit";

$output = str_replace($var ."\r\n", "", $input ."\r\n");

answered Oct 4, 2012 at 3:12

Adam Plocher

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3 Comments

Andrey Over a year ago

If I just did $output = str_replace($var ."\r\n", "", $input); nothing seems to happen, but when I did $output = str_replace($var ."\r\n", "", $input."\r\n");, it left an empty line. I added $newFile = substr($newFile, 0, -2); //Removes newline char and now it works perfectly. Thanks!

Adam Plocher Over a year ago

Ahh, good. You could also do a trim() to remove any trailing and leading whitespace. I appended an extra \r\n so it wouldn't fail to remove the last line.

Andrey Over a year ago

I'll replace it with trim, just in case. It seems like a better option.

Baba · Accepted Answer · 2012-10-04 03:26:09Z

1

You can use trim to remove all white spaces
file can read all the content as array
You can use array_map to apply trim to all array content
You can use in_array to check element of an array

Example

$fileContents = array_map("trim",file("hi.test"));
var_dump($fileContents);

Output

array
  0 => string 'Kate' (length=4)
  1 => string 'Johnny' (length=6)
  2 => string 'Bill' (length=4)
  3 => string 'Kermit' (length=6)

To check if Bill is there

if(in_array("Bill", $fileContents))
{
    //Bill is here 
}

edited Oct 4, 2012 at 3:26

answered Oct 4, 2012 at 3:21

Baba

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Comments

Arun Killu · Accepted Answer · 2012-10-04 03:17:51Z

0

while(!feof($file)){
   $stringData = fgets($file);//read a line on every itration

if (strpos($stringData , "Bill") !== false) {
//do somting
}

}

answered Oct 4, 2012 at 3:17

Arun Killu

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