echo 和 print

redd

echo

1. <?php
   
2. $txt1="Learn PHP";
   
3. $txt2="redd.mx.nf";
   
4. $cars=array("Volvo","BMW","SAAB");
   
5. 
   
6. echo $txt1;
   
7. echo "<br>";
   
8. echo "Study PHP at $txt2";
   
9. echo "My car is a {$cars[0]}";
   
10. ?>

複製代碼

print

1. <?php
   
2. $txt1="Learn PHP";
   
3. $txt2="redd.mx.nf";
   
4. $cars=array("Volvo","BMW","SAAB");
   
5. 
   
6. print $txt1;
   
7. print "<br>";
   
8. print "Study PHP at $txt2";
   
9. print "My car is a {$cars[0]}";
   
10. ?>

複製代碼

redd

echo - 能够输出一个以上的字符串
print - 只能输出一个字符串，并始终返回 1
echo 可以這樣，但 print 不行：

1. echo "This", " string", " was", " made", " with multiple parameters.";

複製代碼

提示：echo 比 print 稍快，因为它不返回任何值。

admin

1. $num = 13.9;
   
2. 
   
3. printf("數值為：%s", $num);
   
4. printf("數值為：%.2f", $num);

複製代碼

printf 可以設定更複雜的格式。

redd

The differences are small: echo has no return value while print has a return value of 1 so it can be used in expressions. echo can take multiple parameters (although such usage is rare) while print can take one argument. echo is marginally faster than print.