Analysis of the fprintf() function in PHP (with detailed code explanation)

File writing and reading are essential capabilities for various languages, PHP has built-in# The ##fprintf() function can write the formatted string into the stream. This article will take you to take a look at how to use the fprintf() function to modify the data. Write.

1. Syntax:

fprintf(resource $handle, string $format, mixed $arg1, $atg2...)

• $handle: Required, specifies where to write/output the string .

• #$format: Required, specifies the string and how to format the variables in it.

• $arg1 : Required, specifies the parameter inserted into the first % symbol in the format string.

• #$arg2 : Optional, specifies the parameters inserted into the second % symbol in the format string.

• #$argn : Optional, specifies the parameter inserted at the nth % symbol in the format string.

• Return value: Returns the length of the written string (

  int).
  

Note: If there are more

% symbols than $arg arguments, placeholders must be used. The placeholder is inserted after the % symbol and consists of numbers followed by "\$".

2. Code example:

Create a new text1.text with empty content

<br/>

PHP document

<?php
$number = 9;
$str = "Are you OK?";
$file = fopen("test1.txt","w");
echo fprintf($file,"There are %u Not OK in %s.",$number,$str);
//输出：34
?>

text1.php内容：There are 9 Not OK in Are you OK?.

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