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<?php $key = openssl_pkey_get_public('-----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAt+S0ZxgyQ7BPcmz/JEa7 yEhcKDZTE9TgOF/9cW1w+quFvC43daYmyRpT3asYOm7YPGCmaQ7hUx9XKUUlEdXz Zr1uvvDyFZdtS45+4nQ5DOI20mZoUHGV82rAMmvf5vote/JJu8Gt01ZUARfsMl+K DtwpVDHN6LGPBOW8l8abktk1tL/oiwLSVrO2cM/IgBZETDkQpUaZxZx3yUcueEQ+ BFrtS3IYaEny938daQzElNdCaip0f68Ig0gOTPzwkzDOgyOhyjFRxx4aisGzIlXu TFkqzIz7oC3JysgS5EhlwmsEIAelbZWpgc17HK2aWIzqlT99hB+kKv2fauxH/fgT nQIDAQAB -----END PUBLIC KEY-----'); $details = openssl_pkey_get_details($key); echo bin2hex($details['rsa']['e']); // "010001"

preferences:
35.83 ms | 402 KiB | 5 Q