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<?php /** * while和do...while的区别 */ echo "----------while和do...while的区别----------<br>"; while (false){ echo "1<br>"; } do{ echo "2<br>"; }while(false); /*以上只输出2*/ /** * for的复杂用法 */ echo "----------for的复杂用法----------<br>"; for ($i=0,$j=10; $i<10 || $j>0 ; $i++,$j--){ echo "i = {$i} , j = {$j} <br>"; } echo "----------for的复杂用法2----------<br>"; for ($i=1;$i<=9;$i++){ for ($j=1;$j<=$i;$j++){ echo "$j x $i = ".($j*$i)." "; } echo "<br>"; } /** * goto跳转(方便,但是被唾弃的一个命令,不推荐使用) */ echo "----------goto跳转----------<br>"; echo "1<br>"; goto biaoji; echo "2<br>"; echo "3<br>"; biaoji: echo "4<br>"; /** * function函数 * function_exists判断函数是否存在 */ echo "----------function函数----------<br>"; //$jieguo = 0; jiafa(1,2); if (function_exists("jiafa")){ echo "存在<br>"; }else{ echo "不存在<br>"; } echo $jieguo; // 因为jieguo是局部变量,所以会报错; exit( "----------exit()结束脚本----------<br>"); echo "exit以后的内容不打印"; /** * 下面两个命令,与while和for相关: * break退出循环 * continue直接进入下一次循环 */ /** * function函数 */ function jiafa($yuansu1,$yuansu2){ echo $yuansu1+$yuansu2; $jieguo = $yuansu1+$yuansu2; echo "<br>"; }
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