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';".
php uses linux commands to determine whether the file exists
Linux one command to determine whether the file exists
[ -f qipa250.txt ] && echo yes || echo no
-f file name file exists is true.
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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