The first two, file and file_get_contents are very similar. They both read an entire file, but file reads the file into an array, while file_get_contents reads it into a string. The array returned by file will be separated by newline, but each element will still have the terminating newline attached, so you will still need … Read more
IMO it’s the different way to resolve a name from the OS and PHP. Try: echo gethostbyname(“host.name.tld”); and var_export (dns_get_record ( “host.name.tld”) ); or $dns=array(“8.8.8.8″,”8.8.4.4”); var_export (dns_get_record ( “host.name.tld” , DNS_ALL , $dns )); You should found some DNS/resolver error.
Both r+ and w+ can read and write to a file. However, r+ doesn’t delete the content of the file and doesn’t create a new file if such file doesn’t exist, whereas w+ deletes the content of the file and creates it if it doesn’t exist.
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); … Read more
The proper thing to do is check errno when fopen returns NULL. I’m going to guess that your problem is that you’re trying to write to a filesystem that doesn’t allow \n in filenames, but it could be a permissions issue as well.
For a large file, reading all the lines into an array with file() is a bit wasteful. Here’s how you could read the file and maintain a buffer of the last 5 lines: $lines=array(); $fp = fopen(“file.txt”, “r”); while(!feof($fp)) { $line = fgets($fp, 4096); array_push($lines, $line); if (count($lines)>5) array_shift($lines); } fclose($fp); You could optimize this … Read more
As long as your program is running, if you keep opening files without closing them, the most likely result is that you will run out of file descriptors/handles available for your process, and attempting to open more files will fail eventually. On Windows, this can also prevent other processes from opening or deleting the files … Read more
Much simpler: <?php if( strpos(file_get_contents(“./uuids.txt”),$_GET[‘id’]) !== false) { // do stuff } ?> In response to comments on memory usage: <?php if( exec(‘grep ‘.escapeshellarg($_GET[‘id’]).’ ./uuids.txt’)) { // do stuff } ?>
It looks like Microsoft has deprecated lots of calls which use buffers to improve code security. However, the solutions they’re providing aren’t portable. Anyway, if you aren’t interested in using the secure version of their calls (like fopen_s), you need to place a definition of _CRT_SECURE_NO_DEPRECATE before your included header files. For example: #define _CRT_SECURE_NO_DEPRECATE … Read more
Replace ‘\n’ with “\n”. The escape sequence is not recognized when you use ‘. See the manual. For the question of how to write line endings, see the note here. Basically, different operating systems have different conventions for line endings. Windows uses “\r\n”, unix based operating systems use “\n”. You should stick to one convention … Read more