How to determine whether the php linux file path exists

php How to determine whether the linux file path exists: 1. Use the linux command "[ -f qipa250.txt ] && echo yes || echo no" to determine whether the file exists; 2. Call the linux command through php. The code is "$pdf_file_exists = '[ -f ' . $pdf_file_url . ' ] && echo true || echo false';".

The operating environment of this tutorial: linux5.9.8 system, PHP8.1, Dell G3 computer.

php uses linux commands to determine whether the file exists

Linux command to determine whether the file exists

[ -f qipa250.txt ] && echo yes || echo no

-f File name is true if the file exists .

If [-f qipa250.txt] is true, echo yes will be executed. Echo no will no longer be executed due to the existence of the or statement ||.

It is important to note that the logic and logic here may be worthy of careful consideration.

php calls linux command method

//指定文件路径
$pdf_file_url='/data/web/QipaFile/qipa250.pdf';
//命令
$pdf_file_exists = '[ -f ' . $pdf_file_url . ' ] && echo true || echo false';
//执行
echo $pdf_file_exists_result = system($pdf_file_exists);

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