php - calling database to check for errors in a web app -

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i'm building web app check errors in our mobile app has web interface. i'm having trouble calling database through php. in mobile app called in objective c by:

-(bool)login:(nsstring *)username password:(nsstring *)password{  // create new sbjson parser object nsstring * passwordtoserver = [self sha1:[nsstring stringwithformat:@"removed security", password]]; nsstring * authtoken = [self sha1:[nsstring stringwithformat:@"%@%@%@", securestring, username, passwordtoserver]]; nsdata* data = [nsdata datawithcontentsofurl:                 [nsurl urlwithstring:[nsstring stringwithformat:@"%@/%@%@", serverurl, @"api/login/", authtoken]]]; // json nsstring nsdata response nsstring *json_string = [[nsstring alloc] initwithdata:data encoding:nsutf8stringencoding]; if([json_string isequal:@"error"]){     loggedin = false;     return false; } else{     //get campagns

how call server using php if have serverurl, securestring , passwordtoserver?

i've tried using doesn't seem work:

<?php mysql_connect("mydatabaseurl", "securestring", "passwordtoserver") or die(mysql_error());  ?>

i think mobile app you're looking @ client side application talks server application connects database (judging login url , authtoken). looks you're writing php server application, means need know mysql database server information mobile app's server application using.


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