Search String and Return Line PHP

Question

I'm trying to search a PHP file for a string and when that string is found I want to return the whole LINE that the string is on. Here is my example code. I'm thinking I would have to use explode but cannot figure that out.

$searchterm =  $_GET['q'];

$homepage = file_get_contents('forms.php');

 if(strpos($homepage, "$searchterm") !== false)
 {
 echo "FOUND";

 //OUTPUT THE LINE

 }else{

 echo "NOTFOUND";
 }

martin · Accepted Answer · 2012-03-15T19:47:14.757

20

Just read the whole file as array of lines using file function.

function getLineWithString($fileName, $str) {
    $lines = file($fileName);
    foreach ($lines as $lineNumber => $line) {
        if (strpos($line, $str) !== false) {
            return $line;
        }
    }
    return -1;
}

edited Mar 15 '12 at 19:47

answered Mar 15 '12 at 14:48

martin

93,354
25
191
226

1

Short circuits on the first occurence of the magic string. Also does not return the line, only the line number that the string happened on. – Hasteur Mar 15 '12 at 16:52
1

I was able to get the contents of that line by echoing the $line. Works great! – Haru Mar 15 '12 at 16:56
Ou, sorry I thought you wanted just the line number, now it's fixed. – martin Mar 15 '12 at 19:47
@Martin What if I need not the current line content but the next line content? cheers :) – Memo Lestas Sep 09 '15 at 02:21
This will be problematic if the file is gigantic – Typewar Sep 01 '21 at 23:21

score 2 · Answer 2 · edited Aug 06 '19 at 19:00

You can use fgets() function to get the line number.

Something like :

$handle = fopen("forms.php", "r");
$found = false;
if ($handle) 
{
    $countline = 0;
    while (($buffer = fgets($handle, 4096)) !== false)
    {
        if (strpos($buffer, "$searchterm") !== false)
        {
            echo "Found on line " . $countline + 1 . "\n";
            $found = true;
        }
        $countline++;
    }
    if (!$found)
        echo "$searchterm not found\n";
    fclose($handle);
}

If you still want to use file_get_contents(), then do something like :

$homepage = file_get_contents("forms.php");
$exploded_page = explode("\n", $homepage);
$found = false;

for ($i = 0; $i < sizeof($exploded_page); ++$i)
{
    if (strpos($buffer, "$searchterm") !== false)
    {
        echo "Found on line " . $countline + 1 . "\n";
        $found = true;
    }
}
if (!$found)
    echo "$searchterm not found\n";

@JohnMagnolia http://www.php.net/manual/en/function.fgets.php - It's the buffer size. It will read 4096 -1 bytes. — BMN, Dec 08 '13 at 21:18

score 1 · Answer 3 · answered Mar 15 '12 at 14:40

1

If you use file rather than file_get_contents you can loop through an array line by line searching for the text and then return that element of the array.

PHP file documentation

answered Mar 15 '12 at 14:40

JaredMcAteer

21,688
5
49
65

score 1 · Answer 4 · answered Mar 15 '12 at 14:40

You want to use the fgets function to pull an individual line out and then search for the

<?PHP   
$searchterm =  $_GET['q'];
$file_pointer = fopen('forms.php');
while ( ($homepage = fgets($file_pointer)) !== false)
{
    if(strpos($homepage, $searchterm) !== false)
    {
        echo "FOUND";
        //OUTPUT THE LINE
    }else{
    echo "NOTFOUND";
    }
}
fclose($file_pointer)

score 1 · Answer 5 · edited May 23 '17 at 12:32

1

Here is an answered question about using regular expressions for your task.

Get line number from preg_match_all()

Searching a file and returning the specified line numbers.

edited May 23 '17 at 12:32

Community

1
1

answered Mar 15 '12 at 15:00

Thomas Bates

677
4
15

Search String and Return Line PHP

5 Answers5

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