Retrieving thumbprint of Certificate

[Imtiyaz]

my requirement is to get thumbprint of the certificate and I am trying to use this 

$thumb = openssl_x509_fingerprint($certContent,"RSA-SHA256",false);

$thumb1 = openssl_x509_fingerprint($certContent,"sha256",false);

But the return of the above is not matching with the thumbprint.

when I open the cert and check "Details" --> Thumbprint , it is different than what is returned from above function. when I check here "signature algorithm = sha256RSA"   and "signature hash algorithm = sha256"

Please let me know if I am missing something.

[Imtiyaz]

now it worked with "sha1" but question whysha256 did not work because when I check the cert Details and "signature hash algorithm" is sha256 so I assumed that the value should sha256.