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How to write in a file in PHP?

PHP Write File

PHP fwrite() and fputs() functions are used to write data into file. To write data into file, you need to use w, r+, w+, x, x+, c or c+ mode.

PHP Write File - fwrite()

The PHP fwrite() function is used to write content of the string into file.

Syntax

int fwrite ( resource $handle , string $string [, int $length ] )  

Example

<?php  
$fp = fopen('data.txt', 'w');//opens file in write-only mode  
fwrite($fp, 'welcome ');  
fwrite($fp, 'to php file write');  
fclose($fp);  
  
echo "File written successfully";  
?>  

Output: data.txt
welcome to php file write

PHP Overwriting File

If you run the above code again, it will erase the previous data of the file and writes the new data. Let's see the code that writes only new data into data.txt file.

<?php  
$fp = fopen('data.txt', 'w');//opens file in write-only mode  
fwrite($fp, 'hello');  
fclose($fp);  
  
echo "File written successfully";  
?>  

Output: data.txt
hello

PHP Append to File

If you use a mode, it will not erase the data of the file. It will write the data at the end of the file. Visit the next page to see the example of appending data into file.