Description:
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---
From manual page: http://www.php.net/function.openssl-pkcs7-verify%23Return%20Values
---

// $file -  signed message 
// $ca - Array of Trusted Certificate
// $input_content - Actual Input Data for verification

$res= openssl_pkcs7_verify($file,PKCS7_DETACHED,
"certverify.pem",$ca,$ca[1],$input_content);

Test script:
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For the code, $input_content i have passed the input value for detached type. it shows the Error as, 
error:2107507A:PKCS7 routines:PKCS7_verify:no content

it doesnot consider the input content will be in $input_content. It overwrite the null value for that text file.

For attached signed content ,the above code works fine.