I need to scan through a 30MB text file - it's a list of world cities - How can I access this file, I feel like a File_Get_Contents will give my server a stroke
Just fopen it and then use fgets.
Filesystem functions come handy in this situation.
Example
$filename = "your_file_path";
// to open file
$fp = fopen($filename, 'r'); // use 'rw' to open file in read/write mode
// to output entire file
echo fread($fp, filesize($filename));
// to close file
fclose($fp);
References
(some handy functions)
All Filesystem Functions
fopen() - open file
fread() - read file content
fgets() - to get line
fwrite() - write content to file
fseek() - change file pointer's position
rewind() - rewind file pointer to pos 0
fclose() - close file
...
<?php
$fh = #fopen("inputfile.txt", "r");
if ($fh) {
while (($line = fgets($fh)) !== false) {
echo $line;
// do something with $line..
}
fclose($fh);
}
?>
More information/examples on http://pt.php.net/manual/en/function.fgets.php
Related
I am trying to write to a file and then read the data from the same file. But sometimes I am facing this issue that the file reading process is getting started even before the file writing gets finished. How can I solve this issue ? How can i make file writing process finish before moving ahead?
// writing to file
$string= <12 kb of specific data which i need>;
$filename.="/ttc/";
$filename.="datasave.html";
if($fp = fopen($filename, 'w'))
{
fwrite($fp, $string);
fclose($fp);
}
// writing to the file
$handle = fopen($filename, "r") ;
$datatnc = fread($handle, filesize($filename));
$datatnc = addslashes($datatnc);
fclose($handle);
The reason it does not work is because when you are done writing a string to the file the file pointer points to the end of the file so later when you try to read the same file with the same file pointer there is nothing more to read. All you have to do is rewind the pointer to the beginning of the file. Here is an example:
<?php
$fileName = 'test_file';
$savePath = "tmp/tests/" . $fileName;
//create file pointer handle
$fp = fopen($savePath, 'r+');
fwrite($fp, "Writing and Reading with same fopen handle!");
//Now rewind file pointer to start reading
rewind($fp);
//this will output "Writing and Reading with same fopen handle!"
echo fread($fp, filesize($savePath));
fclose($fp);
?>
Here is more info on the rewind() method http://php.net/manual/en/function.rewind.php
I have mentioned the URL through which i got the solution. I implemented the same. If you want me to copy the text from that link then here it is :
$file = fopen("test.txt","w+");
// exclusive lock
if (flock($file,LOCK_EX))
{
fwrite($file,"Write something");
// release lock
flock($file,LOCK_UN);
}
else
{
echo "Error locking file!";
}
fclose($file);
Use fclose after writing to close the file pointer and then fopen again to open it.
I have a PHP loop whereby I read and process the contents of several files.
<?php
foreach($files as $file)
{
$f = fopen($file, 'r');
$content = fread($f, filesize($file));
import($content);
fclose($f);
}
?>
However, after several iterations of the loop, I am still getting a memory exhausted error on the fread() line - my understanding was that using fclose() would free up the memory of the resource, but is this not the case?
I have read a number of other questions on the matter and they all referenced using fclose(), which I was already doing. I'm also dumping out memory_get_usage()/memory_get_peak_usage() and they just keep going up until it fails.
Am I misunderstanding how fclose() handles freeing up memory?
<?php
foreach($files as $file)
{
$f = fopen($file, 'r');
$content = fread($f, filesize($file));
import($content);
fclose($f); // this close file
unset($content); // this free memory allocated to content of file
}
?>
In PHP im creating a tool to open txt file with an integer in it, increment the number, save the number to a variable and then save and close the file. this is the code i have for it and it doesnt seem to work when i have it on my test server. Can anyone clue me in as to why this isnt working properly?
//opens pclnumber.txt to $handle, saves number to $number, Increments number in text file, saves and closes file
$handle = fopen("pclnumber.txt", "w+");
$number = fread($handle);
fwrite($handle, $number+1);
fclose($handle);
over all you must set reading permission on your file, and than you can use the follow code:
$filename = "pclnumber.txt";
//read file content
$handle = fopen($filename, "r");
$number = fread($handle, sizeof($filename));
fclose($handle);
//update file content
$handleWrite = fopen($filename, "w+");
fwrite($handleWrite, $number+1);
fclose($handleWrite);
Bye,
Marco
Im trying to extract the values between eng_tid
and eng_data for http://fdguirhgeruih.x10.mx/html.txt and I keep getting T string errors.
why do I keep getting errors
<? php
//First, open the file. Change your filename
$file = "http://fdguirhgeruih.x10.mx/html.txt";
$word1='tid';
$word2='data';
$handle = fopen($file, "r");
$contents = fread($handle, filesize($file));
fclose($handle);
$between=substr($contents, strpos($contents, $word1), strpos($contents, $word2) - strpos($contents, $word1));
echo $between;
?>
UPDATE after seeing error messages...
Instead of fread() and attempting to use the size in bytes of your target file, you may simply use file_get_contents() to retrieve the remote file. Your error is because PHP wants to read the filesize of the file as though it is local, but it is a remote file over HTTP. filesize() reports 0 and an error. Instead do
// Don't do this...
//$handle = fopen($file, "r");
//$contents = fread($handle, filesize($file));
//fclose($handle);
// Instead do this...
$contents = file_get_contents($file);
Can anyone tell the method to modify/delete the contents of a text file using PHP
Using file_put_contents:
file_put_contents($filename, 'file_content');
If you want to append to the file instead of replacing it's contents use:
file_put_contents($filename, 'append_this', FILE_APPEND);
(file_out_contents is the simpler alternative to using the whole fopen complex.)
By using fopen:
if (is_writable($filename)) {
if (!$handle = fopen($filename, 'w')) {
echo "Cannot open file ($filename)";
exit;
}
if (fwrite($handle, $somecontent) === FALSE) {
echo "Cannot write to file ($filename)";
exit;
}
echo "Success, wrote to file ($filename)";
fclose($handle);
}
Write "" to a file to delete its contents.
To delete contents line by line use:
$arr = file($fileName);
unset($arr[3]); // 3 is an arbitrary line
then write the file contents. Or are you referring to memory mapped files?
There are number of ways to read files. Large files can be handled very fast using
$fd = fopen ("log.txt", "r"); // you can use w/a switches to write append text
while (!feof ($fd))
{
$buffer = fgets($fd, 4096);
$lines[] = $buffer;
}
fclose ($fd);
you can also use file_get_contents() to read files. its short way of achieving same thing.
to modify or append file you can use
$filePointer = fopen("log.txt", "a");
fputs($filePointer, "Text HERE TO WRITE");
fclose($filePointer);
YOU CAN ALSO LOAD THE FILE INTO ARRAY AND THEN PERFORM SEARCH OPERATION TO DELETE THE SPECIFIC ELEMENTS OF THE ARRAY.
$lines = file('FILE WITH COMPLETE PATH.'); // SINGLE SLASH SHOULD BE DOUBLE SLASH IN THE PATH SOMTHING LIKE C://PATH//TO//FILE.TXT
Above code will load the file in $lines array.