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Since it runs long, and prints a lot of information, I dont want to wait until it has run, I want to capture its content while its running. Is it possible? If I could do it with exec() it would wait until its over
You can try it with popen. Example:
<?php
$command = ('ping stackoverflow.com');
$handle = popen ($command,'r');
while (!feof($handle))
{
$buffer = fgets($handle, 4096);
echo $buffer;
}
pclose($handle);
?>
In a Windows-batchfile don't forget the exit (http://de3.php.net/manual/en/function.popen.php#77723).
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if(isset($_POST["delete"])){
$file_name = 'ids';
touch($file_name);
$handle = fopen($file_name, 'r+');
$stream = file_get_contents('ids');
$pieces = explode(" ", $stream);
unset($pieces[0]);
unset($pieces[1]);
unset($pieces[2]);
file_put_contents("ids", "\n" );
file_put_contents("ids", $pieces);
fclose($handle);
}
So I'm sure this is wicked messy and a terrible way to accomplish my goal but I am learning PHP for school and this is giving me a lot of issues.
When I press my button I want to take the content I have in 'ids', change it by deleting the strings located in the array at 0,1,2 and then rewrite the new content to 'ids'. Any help would be appreciated.
I'm not sure where you are getting stuck, but I would guess it is regarding the "re-assembly" process, so I'll fix that.
Untested Code:
if(isset($_POST["delete"])){
$file_name='ids';
touch($file_name);
$handle=fopen($file_name, 'r+');
$stream=file_get_contents($file_name);
$content=str_replace(" ","\n",explode(" ", $stream,4)[3]); // explode into a max of 4 elements, access the last element, replace spaces with `\n`
file_put_contents($file_name,$content);
fclose($handle);
}
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I have read the manaul, and knew that w+ write and read, w only write. But how to understand it?
$file_name = $_SERVER['DOCUMENT_ROOT']."/../data/test.txt"; //file is exist
$fp = fopen($file_name, 'w+');
fwrite($fp, 'hello, world!');
$len = filesize($file_name);
echo $len; //13
$contents = fread($fp, $len);
var_dump($contents);//string(0) "" why?
fclose($fp);
Both options w and w+ truncates file during opening with fopen. Difference is that you can read exactly that was written during current session working with file(I mean fopen->fwrite->fread(will not empty)->fclose). So if you try to read file opened with w and w+ = the result in both case should be empty
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I wrote a php script that reads a log file using fopen and extracts all necessary info.
The issue is that i need to extract the info as an array concurrently from two files.
How do i do that with fopen ?
You can have as many file pointers are required. You can even call fopen in loop like
<?php
$files = array("file1","file2","file3");
$fps = array();
foreach($files as $fls)
$fps[] = fopen($fls);
///rest of the code.
?>
fopen returns a pointer to the file.
Just call fopen and fread twice:
$filename1 = "file1.log";
$handle1 = fopen($filename1);
$content1 = fread($handle1, filesize($filename1));
fclose($handle1);
$filename2 = "file2.log";
$handle2 = fopen($filename2);
$content2 = fread($handle2, filesize($filename2));
fclose($handle2);
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Following is my piece of code which writes to file.
<?php
$fileWrite = fopen("c.txt", "w+");
for($i=0;$i<5;$i++) {
$bytes = fwrite($fileWrite, $i);
}
fclose($fileWrite);
I am getting 01234. It means , pointer is appending to last location, I don't want to append data. Instead need to write 4 in the file.
Then you need to ftruncate the file before writing to it:
ftruncate($fileWrite, 0);
$bytes = fwrite($fileWrite, $i);
This is obviously pretty pointless to do in a loop, but I expect you know that.
I personally recommend using file_put_contents for this simple task. It's easier to use and will not append to the end of the file (unless specified that way).
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I have a .php file that contains array data like below:
$config['setting_one'] = true;
$config['setting_two'] = "some string";
$config['setting_three']['option1'] = "some string";
What is the correct way to find the line starts with $config['setting_two'] and replace the line with $config['setting_two'] = "new string"; (new string will come from a post value).
There is no correct way.
The correct way is "don't do that".
You include the php code, and then update the variable by simply setting it.
What are you trying to do?
You will have to read the file line by line using fgets
$config = array();
while(($line = fgets($handle, 4096) ) !== false) {
$config[] = $line;
}