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 |