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PHP 5.2.x output operation details

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Release： 2016-07-25 08:55:39
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  2. $a = "hello";
  3. $b = "world";
  4. echo $a,$b,"
    ";
  5. echo $a.$b."< ;br>";
  6. print $a.$b;
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output result: helloworld helloworld helloworld

But this will cause a compilation error:

  2. print $a,$b;
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Note: There is a comma in the middle of $a $b. 2. The difference between single quotes and double quotes:

  2. $a = "hello";
  3. $b = "world";
  4. echo "$a $b";
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Output: hello world

echo '$a $b'; Then the output is: $a $b

The following can also be output normally:

  2. $arr = array("a" => 1);
  3. echo $arr['a'];
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Related labels：
php 5.2.x 输出操作的细节
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