PHP print类函数总结
<?php /*************by garcon1986*********///print和echo的区别：//1. echo可以输入多个字符串，而print不能。print "hello"."world"; //成功echo "hello"."world"; //成功//print "hello","world"; //失败echo "hello","world"; //成功//2. echo比print更快。$stime = microtime(true);print "hello"."world";$etime = microtime(true);$total = $etime - $stime;echo $total.'<br/>';//microtime — Return current Unix timestamp with microseconds$stime2 = microtime(true);echo "hello"."world";$etime2 = microtime(true);$total2 = $etime2 - $stime2;echo $total2.'<br/>';//执行结果://helloworld0.0014331340789795//helloworld0.00018310546875//看到echo比print更快。//print_r—Prints human-readable information about a variable或数组$a = "sajfd sfjal sfjalwureoi weu sj we fk io ";print_r($a);echo '<br />';$a = array("b","c","d");print_r($a);echo '<br />';//var_dump— Dumps information about a variable 或数组//var_dump -- 打印变量的相关信息$a = "sajfd sfjal sfjalwureoi weu sj we fk io ";var_dump($a);echo '<br />';$a = array("b","c","d");var_dump($a);echo '<br />';var_dump(array("b","c","d"));echo '<br />';?><?php/************by garcon1986********///%% - 返回百分比符号//%b - 二进制数//%c - 依照 ASCII 值的字符//%d - 带符号十进制数//%e - 可续计数法（比如 1.5e+3）//%f - 浮点数(local settings aware)//%F - 浮点数(not local settings aware)//%o - 八进制数//%s - 字符串//%u - 无符号十进制数//%x - 十六进制数（小写字母）//%X - 十六进制数（大写字母）//printf()函数输出格式化的字符串$str = "hello";$number = 456;//example1printf("%s world. Day number %s", $str, $number); //输出： hello world. Day number 456print "<br/>";//example2printf("%%", $number);//%print "<br/>"; printf("%b", $number);//111001000print "<br/>";printf("%c", $number);//ascii码print "<br/>";printf("%d", $number);//456print "<br/>";printf("%e", $number);//4.560000e+2print "<br/>";printf("%f", $number);//456.000000print "<br/>";printf("%F", $number);//456.000000print "<br/>";printf("%o", $number);//710print "<br/>";printf("%s", $number);//456print "<br/>";printf("%u", $number);//456print "<br/>";printf("%x", $number);//1c8print "<br/>";printf("%X", $number);//1C8print "<br/>";printf("With 2 decimals: %1/$.2f<br />With no decimals: %1/$u<br />",$number);//With 2 decimals: 456.00//With no decimals: 456printf("With 2 decimals: %f<br />With no decimals: %1/$u<br />",$number);//With 2 decimals: 456.000000//With no decimals: 456//fprintf() 函数把格式化的字符串写到指定的输出流（例如：文件或数据库）。$file = fopen("text.txt","w");echo fprintf($file, "fprintf 1: %s world. Day number %u", $str, $number).'<br/>';//38echo fprintf($file, "fprintf 2: %f", $number).'<br/>'; //21echo fprintf($file,"fprintf 3: With 2 decimals: %1/$.2f/nWith no decimals: %1/$u",$number).'<br />'; //56//vprintf()函数输出格式化的字符串。//vprintf() 中的 arg 参数位于数组中。数组的元素会被插入主字符串的百分比 (%) 符号处。该函数是逐步执行的。在第一个 % 符号中，插入 arg1，在第二个 % 符号处，插入 arg2，依此类推。vprintf("vprintf: %s world. Day number %u", array($str,$number));//vprintf: hello world. Day number 456echo '<br />';//sprintf() 函数把格式化的字符串写写入一个变量中。$txt = sprintf("sprintf: %s world. Day number %u",$str,$number);echo $txt.'<br />'; //sprintf: hello world. Day number 456//vfprintf() Operates as fprintf() but accepts an array of arguments, rather than a variable number of arguments. echo vfprintf($file, "vfprintf: %s world! Day number %u", array($str, $number)).'<br />'; //37//vsprintf() Operates as sprintf() but accepts an array of arguments, rather than a variable number of arguments. $txt = vsprintf("vsprintf: %s world. Day number %u",array($str,$number)); echo $txt.'<br />'; //vsprintf: hello world. Day number 456?>
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