简单教程
提交运行
代码编辑器：
<?php echo round(1.5,0,PHP_ROUND_HALF_UP) , "<br>"; echo round(-1.5,0,PHP_ROUND_HALF_UP) , "<br>"; echo round(1.5,0,PHP_ROUND_HALF_DOWN) , "<br>"; echo round(-1.5,0,PHP_ROUND_HALF_DOWN) , "<br>"; echo round(1.5,0,PHP_ROUND_HALF_EVEN) , "<br>"; echo round(-1.5,0,PHP_ROUND_HALF_EVEN) , "<br>"; echo round(1.5,0,PHP_ROUND_HALF_ODD) , "<br>"; echo round(-1.5,0,PHP_ROUND_HALF_ODD);
运行结果：