I have a php script that reads text files. I use fgetc() to get every character one by one. I open file to read from with fopen(),and then I use file descriptor returned from fopen() as a first argument to fgetc(). I tried to do the same thing with reading from STDIN. I wanted to run the script in a terminal, give it the whole text (that was in a text file before) and press enter. I thought that the script would read it and will run as if it read from a text file, but it doesn't work. It only works when a type every single character alone and press enter after it. Why is that? Is there a possibility to make the script behave the way I wanted? That I can give it the whole text to the terminal at once? Should I use different functions or something?
$inputFile = fopen($path, "w");
while(($char = fgetc($inputFile)) !== false){
dosomething();
}
What I'm trying to do is to replace $inputFile in fgetc()with STDIN.
See http://php.net/manual/en/features.commandline.io-streams.php, second comment
Note, without the stream_set_blocking() call, fgetcsv() hangs on STDIN, awaiting input from the user, which isn't useful as we're looking for a piped file. If it isn't here already, it isn't going to be.
<?php
stream_set_blocking(STDIN, 0);
$csv_ar = fgetcsv(STDIN);
I think it's the same for fgetc. After all it
string fgetc ( resource $handle ) Gets a character from the given file pointer.
Emphasis mine.
See http://php.net/manual/en/function.fgetc.php
...
Related
What is the best way to overwrite a specific line in a file? I basically want to search a file for the string '#parsethis' and overwrite the rest of that line with something else.
If the file is really big (log files or something like this) and you are willing to sacrifice speed for memory consumption you could open two files and essentially do the trick Jeremy Ruten proposed by using files instead of system memory.
$source='in.txt';
$target='out.txt';
// copy operation
$sh=fopen($source, 'r');
$th=fopen($target, 'w');
while (!feof($sh)) {
$line=fgets($sh);
if (strpos($line, '#parsethis')!==false) {
$line='new line to be inserted' . PHP_EOL;
}
fwrite($th, $line);
}
fclose($sh);
fclose($th);
// delete old source file
unlink($source);
// rename target file to source file
rename($target, $source);
If the file isn't too big, the best way would probably be to read the file into an array of lines with file(), search through the array of lines for your string and edit that line, then implode() the array back together and fwrite() it back to the file.
Your main problem is the fact that the new line may not be the same length as the old line. If you need to change the length of the line, there is no way out of rewriting at least all of the file after the changed line. The easiest way is to create a new, modified file and then move it over the original. This way there is a complete file available at all times for readers. Use locking to make sure that only one script is modifying the file at once, and since you are going to replace the file, do the locking on a different file. Check out flock().
If you are certain that the new line will be the same length as the old line, you can open the file in read/write mode (use r+ as the second argument to fopen()) and call ftell() to save the position the line starts at each time before you call fgets() to read a line. Once you find the line that you want to overwrite, you can use fseek() to go back to the beginning of the line and fwrite() the new data. One way to force the line to always be the same length is to space pad it out to the maximum possible length.
This is a solution that works for rewriting only one line of a file in place with sed from PHP. My file contains only style vars and is formatted:
$styleVarName: styleVarProperty;\n
For this I first add the ":" to the ends of myStyleVarName, and sed replaces the rest of that line with the new property and adds a semicolon.
Make sure characters are properly escaped in myStyleVarProp.
$command = "pathToShellScript folder1Name folder2Name myStyleVarName myStyleVarProp";
shell_exec($command);
/* shellScript */
#!/bin/bash
file=/var/www/vhosts/mydomain.com/$1/$2/scss/_variables.scss
str=$3"$4"
sed -i "s/^$3.*/$str;/" $file
or if your file isn't too big:
$sample = file_get_contents('sample');
$parsed =preg_replace('##parsethis.*#', 'REPLACE TO END OF LINE', $sample);
You'll have to choose delimiters '#' that aren't present in the file though.
If you want to completely replace the contents of one file with the contents of another file you can use this:
rename("./some_path/data.txt", "./some_path/data_backup.txt");
rename("./some_path/new_data.txt", "./some_path/data.txt");
So in the first line you backup the file and in the second line you replace the file with the contents of a new file.
As far as I can tell the rename returns a boolean. True if the rename is successful and false if it fails. One could, therefore, only run the second step if the first step is successful to prevent overwriting the file unless a backup has been made successfully. Check out:
https://www.php.net/manual/en/function.rename.php
Hope that is useful to someone.
Cheers
Adrian
I'd most likely do what Jeremy suggested, but just for an alternate way to do it here is another solution. This has not been tested or used and is for *nix systems.
$cmd = "grep '#parsethis' " . $filename;
$output = system($cmd, $result);
$lines = explode("\n", $result);
// Read the entire file as a string
// Do a str_repalce for each item in $lines with ""
I want to make a .php file downloadable by my users.
Every file is different from an user to another:
at the line #20 I define a variable equal to the user ID.
To do so I tried this: Copy the original file. Read it until line 19 (fgets) then fputs a PHP line, and then offer the file to download.
Problem is, the line is not inserted after line 19 but at the end of the .php file. Here is the code:
if (is_writable($filename)) {
if (!$handle = fopen($filename, 'a+')) {
echo "Cannot open file ($filename)";
exit;
}
for ($i = 1; $i <= 19; $i++) {
$offset = fgets($handle);
}
if (fwrite($handle, $somecontent) === FALSE) {
exit;
}
fclose($handle);
}
What would you do ?
append mode +a in fopen() places the handle's pointer at the end of the file. Your fgets() loop will fail as there's nothing left to read at the end of the file. You're basically doing 19 no-ops. Your fwrite will then output your new value at the end of the file, as expected.
To do your insert, you'd need to rewind() the handle to the beginning, then do your fgets() loop.
However, if you're just wanting people to get this modified file, why bother doing the "open file, scan through, write change, serve up file"? This'd leave a multitude of near-duplicates on your system. A better method would be to split your file into two parts, and then you could do a simple:
readfile('first_part.txt');
echo "The value you want to insert";
readfile('last_part.txt');
which saves you having to save the 'new' file each time. This would also allow arbitrary length inserts. Your fwrite method could potentially trash later parts of the file. e.g. You scan to offset "10" and write out 4 bytes, which replaces the original 4 bytes at that location in the original file. At some point, maybe it turns into 5 bytes of output, and now you've trashed a byte in the original and maybe have a corrupted file.
The a+ mode means:
'a+' Open for reading and writing; place the file pointer at the end of the file. If the file does not exist, attempt to create it.
You probably want r+
'r+' Open for reading and writing; place the file pointer at the beginning of the file.
Put your desired code in one string variable. Where you will have %s at point where you want to customize your code. After that just respond with php MIME type.
eg;
$phpCode = "if (foo == blah) { lala lala + 4; %s = 5; }", $user_specific_variable;
header('Content-type: text/php');
echo $phpCode;
Voila.
NB: Maybe mime type is not correct, I am talking out of my ass here.
I think instead of opening the file in "a+" mode, you should open the file in "r+" mode, because "a" always appends to the file. But I think the write will anyways overwrite your current data. So, the idea is that you'll need to buffer the file, from the point where you intend to write to the EOF. Then add your line followed by what you had buffered.
Another approach might be to keep some pattern in your PHP file, like ######. You can then:
1. copy the original PHP script
2. read the complete PHP script into a single variable, say $fileContent, using file_get_contents()
3. use str_replace() function to replace ###### in $fileContent with desired User ID
4. open the copied PHP script in "a" mode and rewrite $fileContent to it.
Sorry for my bad English.
I must to check 2 csv files, if strings with one id is different, must write to file.
If there is no string with id from 1st file in second file, must write this to file too.
it works, but with element (id=47) i have got a trouble. it into to files, but script sad, that there is only in one.
download script you can from here
http://sil-design.ru/uploads/script.zip
If you do a echo $str1[0].' - '.$str2[0].'<br />'; you will see that the two 47's are never compared. Also I am not sure what the t is in: $f2 = fopen($fileurl, 'rt');.
If you open your backup.csv in notepad and place your cursor after the 47;XL and hold delete to delete anything after it and save. Then try your script again, it should work. It seems that the backup.csv was created in a weird way, I am guessing PHP is getting an EOF before the file has even ended!
I have a file named "connection.php". I want to read the contents of this file to a string. I use fopen, and read functions for reading. But when I am reading I just got only last 2-3 lines on that file. That means no PHP scripts can read like echo, functions etc. How can I read the whole contents on that file?
<?php
$str = file_get_contents('connection.php');
var_dump($str);
?>
note that if 'connection.php' contains '<?php' at the beginning, and you try to output it to a browser, you likely won't see anything unless you perform a "View Source".
Quoting the manual page of fread :
fread() reads up to length bytes from
the file pointer referenced by handle
. Reading stops as soon as one of the
following conditions is met:
length bytes have been read
EOF (end of file) is reached
a packet becomes available (for network streams)
8192 bytes have been read (after opening userspace stream)
If you want to read a whole file, you'll need to use some kind of loop, to read data until you reach the end of the file.
Or, as an alternate (probably easier), you can use file_get_contents, which will get you the whole content of the file with only one function call.
Which means no need for fopen + multiple fread + fclose ;-)
Perhaps your browser is hiding the content because it starts with '<?php'. You can try View Source in your web browser, or echo the contents in the following way:
<?php
$contents = file_get_contents('connection.php');
echo "<pre>";
echo htmlentities($contents);
echo "</pre>";
What is the best way to overwrite a specific line in a file? I basically want to search a file for the string '#parsethis' and overwrite the rest of that line with something else.
If the file is really big (log files or something like this) and you are willing to sacrifice speed for memory consumption you could open two files and essentially do the trick Jeremy Ruten proposed by using files instead of system memory.
$source='in.txt';
$target='out.txt';
// copy operation
$sh=fopen($source, 'r');
$th=fopen($target, 'w');
while (!feof($sh)) {
$line=fgets($sh);
if (strpos($line, '#parsethis')!==false) {
$line='new line to be inserted' . PHP_EOL;
}
fwrite($th, $line);
}
fclose($sh);
fclose($th);
// delete old source file
unlink($source);
// rename target file to source file
rename($target, $source);
If the file isn't too big, the best way would probably be to read the file into an array of lines with file(), search through the array of lines for your string and edit that line, then implode() the array back together and fwrite() it back to the file.
Your main problem is the fact that the new line may not be the same length as the old line. If you need to change the length of the line, there is no way out of rewriting at least all of the file after the changed line. The easiest way is to create a new, modified file and then move it over the original. This way there is a complete file available at all times for readers. Use locking to make sure that only one script is modifying the file at once, and since you are going to replace the file, do the locking on a different file. Check out flock().
If you are certain that the new line will be the same length as the old line, you can open the file in read/write mode (use r+ as the second argument to fopen()) and call ftell() to save the position the line starts at each time before you call fgets() to read a line. Once you find the line that you want to overwrite, you can use fseek() to go back to the beginning of the line and fwrite() the new data. One way to force the line to always be the same length is to space pad it out to the maximum possible length.
This is a solution that works for rewriting only one line of a file in place with sed from PHP. My file contains only style vars and is formatted:
$styleVarName: styleVarProperty;\n
For this I first add the ":" to the ends of myStyleVarName, and sed replaces the rest of that line with the new property and adds a semicolon.
Make sure characters are properly escaped in myStyleVarProp.
$command = "pathToShellScript folder1Name folder2Name myStyleVarName myStyleVarProp";
shell_exec($command);
/* shellScript */
#!/bin/bash
file=/var/www/vhosts/mydomain.com/$1/$2/scss/_variables.scss
str=$3"$4"
sed -i "s/^$3.*/$str;/" $file
or if your file isn't too big:
$sample = file_get_contents('sample');
$parsed =preg_replace('##parsethis.*#', 'REPLACE TO END OF LINE', $sample);
You'll have to choose delimiters '#' that aren't present in the file though.
If you want to completely replace the contents of one file with the contents of another file you can use this:
rename("./some_path/data.txt", "./some_path/data_backup.txt");
rename("./some_path/new_data.txt", "./some_path/data.txt");
So in the first line you backup the file and in the second line you replace the file with the contents of a new file.
As far as I can tell the rename returns a boolean. True if the rename is successful and false if it fails. One could, therefore, only run the second step if the first step is successful to prevent overwriting the file unless a backup has been made successfully. Check out:
https://www.php.net/manual/en/function.rename.php
Hope that is useful to someone.
Cheers
Adrian
I'd most likely do what Jeremy suggested, but just for an alternate way to do it here is another solution. This has not been tested or used and is for *nix systems.
$cmd = "grep '#parsethis' " . $filename;
$output = system($cmd, $result);
$lines = explode("\n", $result);
// Read the entire file as a string
// Do a str_repalce for each item in $lines with ""