# 预定义常量

下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。

The following two tables lists all constants defined by the ps extension.

Constants for line caps
Name | Meaning
--- | ---
`ps_LINECAP_BUTT` |
`ps_LINECAP_ROUND` |
`ps_LINECAP_SQUARED` |

Constants for line joins
Name | Meaning
--- | ---
`ps_LINEJOIN_MITER` |
`ps_LINEJOIN_ROUND` |
`ps_LINEJOIN_BEVEL` |

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