Open for reading only; place the file pointer at the beginning of the file. If the file does not exist, attempt to create it.
If a file by that name already exists, it will be overwritten. When a file is opened for update, both input and output can be done on the resulting stream; however, output cannot be directly followed by input without an intervening fseek or rewind input cannot be directly followed by output without an intervening fseek, rewind, or an input that encounters end-of-file Return Value: On successful completion fopen returns a pointer to the newly opened stream.
In the event of error it returns NULL. The first call tries to append to the file. If that fails when fopen returns 0then try opening the file using the "w" mode.
Create a file or open it for appending. In my test program, logit was called around times and the program took about 12 seconds longer to run. To solve this problem, I changed log to be a static variable. Listing 2 shows the final logit function.
This one has almost no execution time overhead. A static solution that runs faster. As with most solutions, there is a downside. Because fopen usually buffers the output, If the program were to crash, the log file would be incomplete and could mislead you about what the program was doing when it crashed.
If having an up-to-date log file is important, add an fflush call to the parts of the logit function that involve important log messages. Of course, that will incur an execution-time cost, but at least the log file will be accurate.
The best solution is to make two fopen calls: If an accurate and up-to-date log file is mandatory, use fflush to guarantee that the output buffer is flushed before leaving any logging functions.
This article was written by Curtis Krauskopf email at. Copyright The Database Managers, Inc.PHP Arrays Multi PHP Date and Time PHP Include PHP File Handling PHP File Open/Read PHP File Create/Write PHP File Upload PHP Cookies PHP Sessions PHP Filters PHP The file_put_contents() writes a string to a file.
Open the file; Lock the file if LOCK_EX is set; If FILE_APPEND is set, move to the end of the file. Otherwise, . Basic PHP File Handling — Create, Open, Read, Write, Append, Close, and Delete Building Resilient Systems on AWS: Learn how to design and implement a resilient, highly available, fault-tolerant infrastructure on AWS.
Working With Text Files in PHP - Opening and Reading Files place the file pointer at the beginning of the file. 'r+' - Open for reading and writing; place the file pointer at the beginning of the file. We can read a file, read and write to a file, append to the end of a file, move the file pointer to the bottom of the file automatically.
I think what you can do is first read the content of the file and hold it in a temporary variable, now insert the new data to the beginning of the file before also appending the content of the temporary variable. Dec 19, · (Note that if the input files are matched by the pattern *.txt, the output file must not also match that pattern unless it is located in a different directory so the input file pattern won't match the output file's pathname.
PHP fopen() Function Complete PHP Filesystem Reference. Definition and Usage. The fopen() function opens a file or URL. (Read/Write. Starts at the beginning of the file) "w" (Write only. Opens and clears the contents of file; or creates a new file .