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Problem with mysqldump and PHP

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I have a rather large database that contains a few large tables and a large number of frequently changing very small tables i need to migrate to another server, and do it quickly so I minimize disrption of our site.


mysqldump doesn\'t seem to take wildcards, so i wanted to write a php script to automate the execution of mysqldump. I can generate the table names and then i put them into a string something like:


$dumpme = \"mysqldump --user=xxxx --password=xxxxx somedatabase $thistable > $thisdump n\";


and then use


$file = exec(\"$dumpme\");


if (!$file) {

echo \"Unable to dump file $thistable!<br> \";




echo \"dump of file $thisdump worked!<br>\";



if I take the string generated by echo $dumpme; and run it in a terminal window, it works.


If I run the php code, it fails.

i have also tried it with :

$file = exec($dumpme);

and it still fails. also shell_exec and passthru


Any ideas?


I thought of using php for generating a long shell script, and running that from the command line.


Any help appreciated

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