在文本中删除条目的Flock没有工作我

Question

I create one function for delete entry in little file in txt format , the problem it´s when i go delete entry show me this message :

Warning: flock() expects parameter 1 to be resource, boolean given in

The Script Function :

<?php
function delete_entry($name_file_db,$id_entry)
{
$fil_del=file("".$name_file_db."");
$fd=fopen("".$name_file_db."","w");

if (flock($fd,LOCK_EX)) 
{
ftruncate($fd,0); 
fputs($fd,"".$fil_del[0]."");
for($de=1;$de<sizeof($fil_del);$de++)
{   
if($de=="".$id_entry."")
{
fputs($fd,"");  
}
else
{
fputs($fd,"".$fil_del[$de].""); 
}   
}
fflush($fd); 
flock($fd, LOCK_UN);
fclose($fd);
}
else
{
if($db_activate_msg_bugs=="si")
{
print "Busy File";
}
}

}
?>

I don´t know why no works , i try differents combinations but continue fail

Thank´s Regards

Answer 1

$fd=fopen("".$name_file_db."","w") probably didn't open a file. fopen() returns false if it fails:

Returns a file pointer resource on success, or FALSE on error.

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BTW ftruncate() is needless, fopen() in mode w implicitly truncates the file. This does also break your code. The blocked process is truncating your file! Consider using a dedicated lock file or open the file nondeconstructive (e.g. mode c).