How to remove bom header in php?

php method to remove the BOM header: first create a code sample file named [1.php]; then read the content of [1.php] through [2.php], and remove [ 1.php] BOM header; finally write the modified content into [3.php].

How to remove BOM header in PHP:

1. To remove BOM in PHP, you can use ltrim( ) function, the function of this function is to remove blank characters or other predefined characters on the left side of the string, function syntax and parameter description.

2. Here we take 1.php with BOM header as an example. 1.php is a simple hello world program. Next, we read the content of 1.php through 2.php. After removing the BOM header of 1.php, we write the modified content to 3.php, so that 3.php is a file without a BOM header.

3. The source code content of php is as follows:

//php源码标识
<?php
//用fopen函数打开1.php文件
$file=fopen("1.php","r") or die ("unable to open file");
//读取1.php文件内容
$con=fread($file,filesize("1.php"));
//重点，调用ltrim将1.php开头的BOM头去掉。
$con=ltrim($con,"\XEF\XBB\XBF");
//创建3.php文件
$newfile=fopen("3.php","w") or die ("unable to create file");
//通过fwrite命令将去掉BOM头的1.php文件的内容写入到3.php
fwrite($newfile,$con);
//关闭文件
fclose($newfile);
fclose($file);
?>

4. Then execute 2.php through the php command, After the execution is completed, a new 3.php file is generated.

5. Use the file and hexdump commands again to check that the BOM header of 1.php has been removed.

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