* 转换编码 | 传入参 | 说明 | | --- | --- | | str | \[ 必填 \] 字符串 | | to | \[ 选填 \] 转换前编码 | | from | \[ 选填 \] 转换后编码 | | 回调参 | 说明 | | --- | --- | | \[ string \] | 处理完字符串 | * 案例 ~~~ $obj = $T_C->convertEncoding('中文123abc'); ~~~ > 中文123abc