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HomeBackend DevelopmentPHP TutorialAnalysis 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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