PHP Learning Code notes, PHP code notes _php Tutorial

PHP Learning Code notes, PHP code essays

16/2/22

String connection

(1) Join operator (".") : It returns the string that is appended to the right argument after the left argument.

(2) Connection assignment operator (". ="): It attaches the right argument to the left argument.

Equivalent to JS inside the + =.

        $b = "East Sunrise West Rain";         $b . = ", the road is not clear but there is fine";         $c = "East Sunrise West Rain";         $c $c. "The road is not clear but there is fine"    ; Echo  $b. "
"; // East Sunrise West Rain, road is not clear but there is clear    Echo  $c. "
"; // East Sunrise West Rain, road is not clear but there is clear

Assignment operations

$a = "Cmflovehxc";
$b = $a;
$c =& $a;
$a = "HXCLOVECMF";

echo $b. "
";
Echo $c;

(1) "=": assigns the value of the right expression to the left operand. It copies the value of the right expression to the left-hand operand. In other words, the left operand is first requested for a piece of memory, and then the copied value is placed in this memory.

Equivalent to JS equals sign. variable assignment; Two variables are two different heap memory.

(2) "=&": Reference assignment means that both variables point to the same data. It will allow two variables to share a piece of memory, and if the memory stored data changes, then the values of the two variables will change.

Two variables are two identical heap memory.

Constant

1 Define ("PI1", 3.14); 2 $p = "PI1"; 3 Echo $p; // PI1 4 Echo constant ($p); // 3.14 5 if (defined($p) = =true) {  6  Echo ' 111 '    7 }else{  8  echo ' 222 '; 9 }// return 111
One//constant () and defined () have a translation function

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