PHP to search within txt file and echo the whole line

And a PHP example, multiple matching lines will be displayed:

<?php$file = 'somefile.txt';$searchfor = 'name';// the following line prevents the browser from parsing this as HTML.header('Content-Type: text/plain');// get the file contents, assuming the file to be readable (and exist)$contents = file_get_contents($file);// escape special characters in the query$pattern = preg_quote($searchfor, '/');// finalise the regular expression, matching the whole line$pattern = "/^.*$pattern.*\$/m";// search, and store all matching occurences in $matchesif(preg_match_all($pattern, $contents, $matches)){   echo "Found matches:\n";   echo implode("\n", $matches[0]);}else{   echo "No matches found";}

Do it like this. This approach lets you search a file of any size (big size won't crash the script) and will return ALL lines that match the string you want.

<?php$searchthis = "mystring";$matches = array();$handle = @fopen("path/to/inputfile.txt", "r");if ($handle){    while (!feof($handle))    {        $buffer = fgets($handle);        if(strpos($buffer, $searchthis) !== FALSE)            $matches[] = $buffer;    }    fclose($handle);}//show results:print_r($matches);?>

Note the way strpos is used with !== operator.

Using file() and strpos():

<?php// What to look for$search = 'foo';// Read from file$lines = file('file.txt');foreach($lines as $line){  // Check if the line contains the string we're looking for, and print if it does  if(strpos($line, $search) !== false)    echo $line;}

When tested on this file:

foozah
barzah
abczah

It outputs:

foozah

Update:
To show text if the text is not found, use something like this:

<?php$search = 'foo';$lines = file('file.txt');// Store true when the text is found$found = false;foreach($lines as $line){  if(strpos($line, $search) !== false)  {    $found = true;    echo $line;  }}// If the text was not found, show a messageif(!$found){  echo 'No match found';}

Here I'm using the $found variable to find out if a match was found.