


Analysis of common string output methods in PHP (echo, print, printf and sprintf)
本文讲述了php常用字符串输出方法。分享给大家共大家参考,具体如下:
1. echo用法:可用echo 直接输出,也可以用echo()输出,无返回值
$string="<b>加粗显示文字</b>"; echo $string; //echo "<br/>"; //echo($string);//效果同上 echo "<br/>"; echo "This ", "is ", " echo test!";//echo输出用逗号隔开的多个字符串 echo "<br/>";
2. print用法:同上echo一样,只是print运行速度比echo慢,且一次只能输出一个字符串,始终返回1
$string="<b>加粗显示文字</b>"; print $string; //print "<br/>"; //print($string);//效果同上 print "<br/>";
3. printf:格式化输出字符串
/* %% - 返回一个百分号 % %b - 二进制数 %c - ASCII 值对应的字符 %d - 包含正负号的十进制数(负数、0、正数) %e - 使用小写的科学计数法(例如 1.2e+2) %E - 使用大写的科学计数法(例如 1.2E+2) %u - 不包含正负号的十进制数(大于等于 0) %f - 浮点数(本地设置) %F - 浮点数(非本地设置) %g - 较短的 %e 和 %f %G - 较短的 %E 和 %f %o - 八进制数 %s - 字符串 %x - 十六进制数(小写字母) %X - 十六进制数(大写字母) */ $num=23; printf("printf输出浮点数:%f",$num);//输出:23.000000 printf("<br/>"); printf("printf输出2位小数浮点数:%1\$.2f <br/>printf输出无小数位:%1\$u",$num);//输出:23.00 printf("<br/>");
4. sprintf:
$name="Tom"; $age=20; $printstr=sprintf("sprintf输出:他名字叫%s,年龄是%u",$name,$age); echo $printstr;//输出:他名字叫Tom,年龄是20
希望本文所述对大家php程序设计有所帮助。
更多php常用字符串输出方法分析(echo,print,printf及sprintf) 相关文章请关注PHP中文网!

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