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.
| Name | Meaning |
|---|---|
| ps_LINECAP_BUTT | |
| ps_LINECAP_ROUND | |
| ps_LINECAP_SQUARED |
| Name | Meaning |
|---|---|
| ps_LINEJOIN_MITER | |
| ps_LINEJOIN_ROUND | |
| ps_LINEJOIN_BEVEL |
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