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As of PHP 5.2.13 and PHP 5.3.2, this constant is only available if PHP is compiled with MD2 support. This requires passing in the -DHAVE_OPENSSL_MD2_H CFLAG when compiling PHP, and enable-md2 when compiling OpenSSL 1.0.0+. OPENSSL_ALGO_MD2 , OPENSSL_ALGO_MD4 , OPENSSL_ALGO_MD5 , OPENSSL_ALGO_SHA1 , OPENSSL_ALGO_DSS1

Note :

These constants were added in 5.4.8.

OPENSSL_ALGO_RMD160 , OPENSSL_ALGO_SHA224 , OPENSSL_ALGO_SHA256 , OPENSSL_ALGO_SHA384 , OPENSSL_ALGO_SHA512