please provide me php scripts for these OpenSSl commands :

Convert the .cer file into a .pem file :
$ openssl x509 -in aps_developer_identity.cer -inform der -out PushChatCert.pem

Convert the private key’s .p12 file into a .pem file:
$ openssl pkcs12 -nocerts -out PushChatKey.pem -in PushChatKey.p12
Enter Import Password:
MAC verified OK
Enter PEM pass phrase:
Verifying - Enter PEM pass phrase:

these above mentioned commands are executed on terminal .... i want to perform conversion from .cer / .p12 to .pem via php script running at the server end !!!

Please help me asap !!!
Thanks

I have cracked this issue myself ! Hereby i'm posting the solution so that any one still looking for the same issue can work out with this issue .



<?php

//convert .cer file to .pem
system('openssl x509 -in path/to/certificate_file.cer -inform DER -out path/to/certificate_file.pem -outform PEM ');

// convert .p12 file to .pem [Note : if u used passphrase while encryting ur key , u need to mention it over here ]
system('openssl pkcs12 -nocerts -out path/to/TestingKey.pem -in path/to/TestingKey.p12 -passout pass:yournewpassphrase -passin pass:initialpassphrase');
system('openssl rsa -in TestingKey.pem -out TestingKey-noenc.pem -passin pass:yournewpassphrase');

?>