PHP Learning Code Essays

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Assignment operations

1 $a = "Cmflovehxc"; 2 $b=$a; 3 $c=&$a; 4 $a = "Cmflovehxc"; 5 6 Echo $b. "
"; 7 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) {  6echo ' 111 '    7 }else{  8echo ' 222 '; 9 }// return 111
One//constant () and defined () have a translation function

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