Summary of the use of PHP print class functions_PHP tutorial

Copy code The code is as follows:

/*************by garcon1986*********/
//The difference between print and echo:
//1. Echo can input multiple strings, but print cannot .
print "hello"."world"; //Success
echo "hello"."world"; //Success
//print "hello","world"; //Failure
echo "hello","world"; //Success
//2. Echo is faster than print.
$stime = microtime(true);
print "hello"."world";
$etime = microtime(true);
$total = $etime - $stime;
echo $total.'
';
//microtime — Return current Unix timestamp with microseconds
$stime2 = microtime(true);
echo "hello"."world";
$etime2 = microtime(true);
$total2 = $etime2 - $stime2;
echo $total2.'
';
//Execution result:
// helloworld0.0014331340789795
//helloworld0.00018310546875
//See echo is faster than print.
//print_r — Prints human-readable information about a variable or array
$a = "sajfd sfjal sfjalwureoi weu sj we fk io ";
print_r($a);
echo '< br />';
$a = array("b","c","d");
print_r($a);
echo '
';
//var_dump — Dumps information about a variable or array
//var_dump -- Prints information about a variable
$a = "sajfd sfjal sfjalwureoi weu sj we fk io ";
var_dump($a );
echo '
';
$a = array("b","c","d");
var_dump($a);
echo '
';
var_dump(array("b","c","d"));
echo '
';
?>
/***********by garcon1986*******/
//%% - Returns the percent symbol
//%b - Binary number
//%c - Character according to ASCII value
//%d - signed decimal number
//%e - continuous counting method (such as 1.5e+3)
//%f - floating point number (local settings aware)
//% F - floating point number (not local settings aware)
//%o - octal number
//%s - string
//%u - unsigned decimal number
//%x - Hexadecimal number (lowercase letters)
//%X - Hexadecimal number (uppercase letters)
//printf() function outputs a formatted string
$str = "hello" ;
$number = 456;
//example1
printf("%s world. Day number %s", $str, $number); //Output: hello world. Day number 456
print "
";
//example2
printf("%%", $number); //%
print "
";
printf("%b", $number); //111001000
print "
";
printf("%c", $number); //ascii code
print "
";
printf("%d", $number); //456
print "
";
printf("%e", $number ); //4.560000e+2
print "
";
printf("%f", $number); //456.000000
print "
" ;
printf("%F", $number); //456.000000
print "
";
printf("%o", $number); //710
print "
";
printf("%s", $number); //456
print "
";
printf("%u" , $number); //456
print "
";
printf("%x", $number); //1c8
print "
" ;
printf("%X", $number); //1C8
print "
";
printf("With 2 decimals: %1$.2f
",$number);
//With 2 decimals: 456.00
//With no decimals: 456
printf("With 2 decimals: %f
With no decimals: %1$u
",$number);
//With 2 decimals: 456.000000
//With no decimals: 456
/ The /fprintf() function writes a formatted string to the specified output stream (for example: file or database).
$file = fopen("text.txt","w");
echo fprintf($file, "fprintf 1: %s world. Day number %u", $str, $number).'
'; //38
echo fprintf($file, "fprintf 2: %f", $number).'
'; //21
echo fprintf( $file,"fprintf 3: With 2 decimals: %1$.2fnWith no decimals: %1$u",$number).'
'; //56
//vprintf() function Output a formatted string.
//The arg parameter in vprintf() is in an array. The elements of the array are inserted into the main string at the percent (%) sign. This function is executed step by step. At the first % sign, arg1 is inserted, at the second % sign, arg2, and so on.
vprintf("vprintf: %s world. Day number %u", array($str,$number)); //vprintf: hello world. Day number 456
echo '
' ;
//sprintf() function writes the formatted string into a variable.
$txt = sprintf("sprintf: %s world. Day number %u",$str,$number);
echo $txt.'
'; //sprintf: hello world. Day number 456
//vfprintf() Operates as fprintf() but accepts an array of arguments, rather than a variable number of arguments.
echo vfprintf($file, "vfprintf: %s world! Day number %u", array($str, $number)).'
'; //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.'
'; //vsprintf: hello world. Day number 456
?>

http://www.bkjia.com/PHPjc/322142.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/322142.htmlTechArticle复制代码 代码如下: ?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...