新加的全局常量
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IMG_WEBP （自 PHP 5.6.25 起）
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LDAP_ESCAPE_DN
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LDAP_ESCAPE_FILTER
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OPENSSL_DEFAULT_STREAM_CIPHERS
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STREAM_CRYPTO_METHOD_ANY_CLIENT
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STREAM_CRYPTO_METHOD_ANY_SERVER
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STREAM_CRYPTO_METHOD_TLSv1_0_CLIENT
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STREAM_CRYPTO_METHOD_TLSv1_0_SERVER
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STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT
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STREAM_CRYPTO_METHOD_TLSv1_1_SERVER
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STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT
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STREAM_CRYPTO_METHOD_TLSv1_2_SERVER
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PGSQL_CONNECT_ASYNC
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PGSQL_CONNECTION_AUTH_OK
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PGSQL_CONNECTION_AWAITING_RESPONSE
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PGSQL_CONNECTION_MADE
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PGSQL_CONNECTION_SETENV
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PGSQL_CONNECTION_SSL_STARTUP
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PGSQL_CONNECTION_STARTED
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PGSQL_DML_ESCAPE
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PGSQL_POLLING_ACTIVE
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PGSQL_POLLING_FAILED
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PGSQL_POLLING_OK
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PGSQL_POLLING_READING
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PGSQL_POLLING_WRITING