php中sprintf函数用法详细

$query = sprintf('INSERT INTO %sUSER (USERNAME, PASSWORD, ' .
               'EMAIL_ADDR, IS_ACTIVE, PERMISSION) VALUES ("%s", "%s", "%s", %d, %d)',
                DB_TBL_PREFIX,
               mysql_real_escape_string($this->username, $GLOBALS['DB']),
               mysql_real_escape_string($this->password, $GLOBALS['DB']),
              mysql_real_escape_string($this->emailAddr, $GLOBALS['DB']),
               $this->isActive,
$this->permission);

<h3>PHP中echo,print,printf,sprintf的区别</h3>
<?PHP
$str='let/'s study php!'';
echo $str."<br/>";
$number=print $str."<br/>";
echo $number."<br/>";
$format="%b%c%d";
$number1=printf($format,88,88,88);
echo "<br/>".$number1;
echo "<br/>".sprintf($format,88,88,88);
?>

<?php
echo "rn第一种情况rn";
$a=array(1,2,3,4,5,6);
$b=array(7,8,9);
 
$c=array_merge ($a,$b);
print_r($c);
$c=$a+$b;
print_r($c);
$c=$b+$a;
print_r($c);
 
 
echo "rn第二种情况rn";
$a=array('a','b','c','d','e','f');
$b=array('a','x','y');
 
$c=array_merge ($a,$b);
print_r($c);
$c=$a+$b;
print_r($c);
$c=$b+$a;
print_r($c);
 
 
echo "rn第三种情况rn";
 
$a=array(
 1=>'a',
 2=>'b',
 3=>'c',
 4=>'d',
 5=>'e',
 6=>'f');
$b=array(
 1=>'a',
 7=>'x',
 8=>'y');
 
$c=array_merge ($a,$b);
print_r($c);
$c=$a+$b;
print_r($c);
$c=$b+$a;
print_r($c);
?>

结果如下：

第一种情况
Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
    [6] => 7
    [7] => 8
    [8] => 9
)
Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
)
Array
(
    [0] => 7
    [1] => 8
    [2] => 9
    [3] => 4
    [4] => 5
    [5] => 6
)
 
第二种情况
Array
(
    [0] => a
    [1] => b
    [2] => c
    [3] => d
    [4] => e
    [5] => f
    [6] => a
    [7] => x
    [8] => y
)
Array
(
    [0] => a
    [1] => b
    [2] => c
    [3] => d
    [4] => e
    [5] => f
)
Array
(
    [0] => a
    [1] => x
    [2] => y
    [3] => d
    [4] => e
    [5] => f
)
 
第三种情况
Array
(
    [0] => a
    [1] => b
    [2] => c
    [3] => d
    [4] => e
    [5] => f
    [6] => a
    [7] => x
    [8] => y
)
Array
(
    [1] => a
    [2] => b
    [3] => c
    [4] => d
    [5] => e
    [6] => f
    [7] => x
    [8] => y
)
Array
(
    [1] => a
    [7] => x
    [8] => y
    [2] => b
    [3] => c
    [4] => d
    [5] => e
    [6] => f
)

1）键名

strtotime(“today”)

<?php
echo date("Y/m/d");
echo "<br />";
echo date("Y.m.d");
echo "<br />";
echo date("Y-m-d");
?>

date("Y-m-d H:i",$unixtime)

function transTime($ustime) {           

　　$ytime = date("Y-m-d H:i",$ustime);             

　　$rtime = date("n月j日 H:i",$ustime);           

　　$htime = date("H:i",$ustime);           

　　$time = time() - $ustime;           

　　$todaytime = strtotime("today");           

　　$time1 = time() - $todaytime;                           

　　if($time < 60){                   

　　　　$str = '刚刚';           

　　}else if($time < 60 * 60){                            

　　　　$min = floor($time/60);                   

　　　　$str = $min.'分钟前';           

　　}else if($time < $time1){                   

　　　　$str = '今天 '.$htime;           

　　}else{                   

　　　　$str = $rtime;           

　　}             

　　return $str;

}