What is the usage of fwrite in php

The function of fwrite function in php is to write the content into an open file. Its usage syntax is such as "fwrite(file, string, length)", where the parameter file specifies the open file to be written. The parameter string specifies the string to be written to the open file.

#The operating environment of this article: Windows 7 system, PHP version 7.4, Dell G3 computer.

What is the usage of fwrite in php?

PHP fwrite() function

Definition and usage

fwrite() function writes the contents to an open file.

The function will stop running when it reaches the specified length or reaches the end of file (EOF) (whichever comes first).

If the function executes successfully, the number of bytes written is returned. On failure, returns FALSE.

Syntax

fwrite(file,string,length)

Parameters

file required. Specifies the open file to be written to.

string Required. Specifies the string to be written to the open file.

length Optional. Specifies the maximum number of bytes to be written.

Tips and Comments

Tips: This function is binary safe. (Meaning that both binary data (such as images) and character data can be written using this function.)

Example

<?php
$file = fopen("test.txt","w");
echo fwrite($file,"Hello World. Testing!");
fclose($file);
?>

The above code will output:

21

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