I have a text file
test.txt
and in the file it has lines that begin with '#'
example
#this is a test
#this is another test
this is not a test
When I run my php script I need it to only grab the lines with the '#' and then remove it so it doesn't show in the echo.
So the output would be....
this is a test
this is another test
I'm just learning php but this is what I have... It reads one line...
<?php
$f=fopen("alertmon_user.txt", "r");
// is this where I need to set the conditions?
echo fgets($f);
fclose($f);
?>
What can I add to this to make this work? Am I on the right track?
Read the file line by line and check if line starts with #.
$handle = fopen("alertmon_user.txt", "r");
if ($handle) {
while (($line = fgets($handle)) !== false) {
if(substr($line, 0, 1) === "#") {
//process line here
echo $line . "</br>"; // add </br> for new line
}
}
fclose($handle);
} else {
// error opening the file.
}
Update : To remove # from line.
If you want to remove # from line then use substr method.
for example.
$updatedLine = substr($line, 1, strlen($line));
echo $updatedLine . "</br>";
Hope it'll help.
I'm trying to edit a file by line using SplFileObject(). I can choose the line of the file I want to edit. But how do I then write a $string to that line?
Here is my code to get the line:
<?php
$file = new SplFileObject('myfile.txt');
$file->seek(9999); // Seek to line no. 10,000
echo $file->current(); // Print contents of that line
?>
How do I insert a string on that line?
Note, I don't want to overwrite the file, I simply want to insert a $string at a given line.
This isn't probably the best solution as it will read the whole file and store it in a string. But since there are no other answers you can use this as your last resource.
$ouput = '';
$file = new SplFileObject("your_file.xxx", 'r');
while (!$file->eof()) {
$line = $file->fgets();
if($line == 'your_condition'){
$line = 'replace this line';
}
$output .= $line;
}
$file = null;
$file = new SplFileObject("your_file.xxx", 'w+');
$file->fwrite($output);
I need to dynamically add in the img src full file path to a file from a .txt file. So far i have been using the below code to populate titles, and descriptions:
< ?php
$myFile = "film_music/feature1.txt";
$lines = file($myFile);//file in to an array<br />
echo $lines[0]; //line 1
? >
The feature file contains all details for movies that will eventually be displayed here:
http://www.londonosophy.com/film_music2.php
Currently the file contains the following rows:
Sightseers (2012)
Dark comedy, featuring Alice Lowe
images/Sightseers-TinaPencil.jpg
Does anyone know php code that can read line X (or line 3 in this case) and dynamically populate the img src="" file path?
Many thanks in advance for your suggestions!
If you need to iterate over lines and need to check if line contains file path (for example, if sometimes there are white lines between blocks and sometimes they are missing), then:
<?php
$myFile = 'film_music/feature1.txt';
$lines = file($myFile);
$needle = 'images/';
$needleLen = strlen($needle);
foreach ($lines AS $line) {
$line = trim($line);
if (substr($line, 0, $needleLen) == $needle) {
echo '<img src="' . $line . '" alt="" />';
}
}
?>
You need to fetch 3rd line of the file every time, because it contains that path of the image.
<?php
global var $raw;
$myFile = "film_music/feature1.txt";
// open file...
$lines = file($myFile);//file in to an array<br />
for($i=2;$i<=no_of_lines;$i+3){
$raw = $lines[$i];
}
// Populate $raw variable where you need.
?>
Use $fh = fopen(...) and loop every line.
while (!feof($fh)) {
$line = fgets($fh);
if ($line === false) {
throw new Exception("File read error");
}
[do your things.]
}
http://www.php.net/manual/en/function.fopen.php
You can read each line of text line as:
$lines=file('file.txt');
$lines=array();
$fp=fopen('file.txt', 'r');
while (!feof($fp))
{
$line=fgets($fp);
//process line however you like
$line=trim($line);
//add to array
$lines[]=$line;
}
fclose($fp);
if you don't need any special processing, this should do what you're looking for
$lines = file($lines, FILE_IGNORE_NEW_LINES);
may this help you... :)
you can check all line of text file with in_array("you want", $lines) as you desire...if its not dynamically....
I'm trying to read a specific line from a text file using php.
Here's the text file:
foo
foo2
How would I get the content of the second line using php?
This returns the first line:
<?php
$myFile = "4-24-11.txt";
$fh = fopen($myFile, 'r');
$theData = fgets($fh);
fclose($fh);
echo $theData;
?>
..but I need the second.
Any help would be greatly appreciated
$myFile = "4-24-11.txt";
$lines = file($myFile);//file in to an array
echo $lines[1]; //line 2
file — Reads entire file into an array
omg I'm lacking 7 rep to make comments. This is #Raptor's & #Tomm's comment, since this question still shows up way high in google serps.
He's exactly right. For small files file($file); is perfectly fine. For large files it's total overkill b/c php arrays eat memory like crazy.
I just ran a tiny test with a *.csv with a file size of ~67mb (1,000,000 lines):
$t = -microtime(1);
$file = '../data/1000k.csv';
$lines = file($file);
echo $lines[999999]
."\n".(memory_get_peak_usage(1)/1024/1024)
."\n".($t+microtime(1));
//227.5
//0.22701287269592
//Process finished with exit code 0
And since noone mentioned it yet, I gave the SplFileObject a try, which I actually just recently discovered for myself.
$t = -microtime(1);
$file = '../data/1000k.csv';
$spl = new SplFileObject($file);
$spl->seek(999999);
echo $spl->current()
."\n".(memory_get_peak_usage(1)/1024/1024)
."\n".($t+microtime(1));
//0.5
//0.11500692367554
//Process finished with exit code 0
This was on my Win7 desktop so it's not representative for production environment, but still ... quite the difference.
If you wanted to do it that way...
$line = 0;
while (($buffer = fgets($fh)) !== FALSE) {
if ($line == 1) {
// This is the second line.
break;
}
$line++;
}
Alternatively, open it with file() and subscript the line with [1].
I would use the SplFileObject class...
$file = new SplFileObject("filename");
if (!$file->eof()) {
$file->seek($lineNumber);
$contents = $file->current(); // $contents would hold the data from line x
}
you can use the following to get all the lines in the file
$handle = #fopen('test.txt', "r");
if ($handle) {
while (!feof($handle)) {
$lines[] = fgets($handle, 4096);
}
fclose($handle);
}
print_r($lines);
and $lines[1] for your second line
$myFile = "4-21-11.txt";
$fh = fopen($myFile, 'r');
while(!feof($fh))
{
$data[] = fgets($fh);
//Do whatever you want with the data in here
//This feeds the file into an array line by line
}
fclose($fh);
This question is quite old by now, but for anyone dealing with very large files, here is a solution that does not involve reading every preceding line. This was also the only solution that worked in my case for a file with ~160 million lines.
<?php
function rand_line($fileName) {
do{
$fileSize=filesize($fileName);
$fp = fopen($fileName, 'r');
fseek($fp, rand(0, $fileSize));
$data = fread($fp, 4096); // assumes lines are < 4096 characters
fclose($fp);
$a = explode("\n",$data);
}while(count($a)<2);
return $a[1];
}
echo rand_line("file.txt"); // change file name
?>
It works by opening the file without reading anything, then moving the pointer instantly to a random position, reading up to 4096 characters from that point, then grabbing the first complete line from that data.
If you use PHP on Linux, you may try the following to read text for example between 74th and 159th lines:
$text = shell_exec("sed -n '74,159p' path/to/file.log");
This solution is good if your file is large.
You have to loop the file till end of file.
while(!feof($file))
{
echo fgets($file). "<br />";
}
fclose($file);
Use stream_get_line: stream_get_line — Gets line from stream resource up to a given delimiter
Source: http://php.net/manual/en/function.stream-get-line.php
You could try looping until the line you want, not the EOF, and resetting the variable to the line each time (not adding to it). In your case, the 2nd line is the EOF. (A for loop is probably more appropriate in my code below).
This way the entire file is not in the memory; the drawback is it takes time to go through the file up to the point you want.
<?php
$myFile = "4-24-11.txt";
$fh = fopen($myFile, 'r');
$i = 0;
while ($i < 2)
{
$theData = fgets($fh);
$i++
}
fclose($fh);
echo $theData;
?>
I like daggett answer but there is another solution you can get try if your file is not big enough.
$file = __FILE__; // Let's take the current file just as an example.
$start_line = __LINE__ -1; // The same with the line what we look for. Take the line number where $line variable is declared as the start.
$lines_to_display = 5; // The number of lines to display. Displays only the $start_line if set to 1. If $lines_to_display argument is omitted displays all lines starting from the $start_line.
echo implode('', array_slice(file($file), $start_line, lines_to_display));
I searched for a one line solution to read specific line from a file.
Here my solution:
echo file('dayInt.txt')[1]
I assume I'm using the fgets() wrong. I'm tring to open a PHP file and then try to match a line in that file with a variable I create. If the line does match then I want to write/insert PHP code to the file right below that line. Example:
function remove_admin(){
$findThis = '<tbody id="users" class="list:user user-list">';
$handle = #fopen("../../fns-control/users.php", "r"); // Open file form read.
if ($handle) {
while (!feof($handle)) // Loop til end of file.
{
$buffer = fgets($handle, 479); // Read a line.
if ($buffer == '<tbody id="users" class="list:user user-list">') // Check for string.
{
Now I want to write PHP code to the file, starting on line 480. How can I do that?
Useful information may be: IIS 6 and PHP 5.2.
Try this:
<?php
function remove_admin(){
$path = "../../fns-control/users.php";
$findThis = '<tbody id="users" class="list:user user-list">';
$phpCode = '<?php echo \'hello world\'; ?>';
#Import file to string
$f = file_get_contents($path);
#Add in the PHP code
$newfile = str_replace($findThis, $findThis . $phpCode, $f);
#Overwrite the existing file
$x = fopen($path, 'w');
fwrite($x, $newfile);
fclose($x);
}