How to remove php bom

Method to remove php BOM: First use the fopen function to open the php file; then read the content of the php file; then call ltrim to remove the BOM header at the beginning of php; finally use the fwrite command to write the php file with the BOM header removed Just import it into a new PHP file.

PHP BOM removal example

PHP can use the ltrim() function to remove BOM. The function of this function is to move Except for blank characters or other predefined characters on the left side of the string, function syntax and parameter descriptions.

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.

The source code content of 2.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);
?>

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

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

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