Menu
What are the differences between .= and += in PHP?
422
Operator != returns true, if its two operands have different values. Operator !== returns true, if its two operands have different values or they are of different types.
The difference is the precedence when we compare AND with && operator. The precedence of AND operator is lower than the operator = when the evaluation is performed, therefore even if both the operators do the same work, the result is different.
$message is used to store variable data. $$message can be used to store variable of a variable. Data stored in $message is fixed while data stored in $$message can be changed dynamically.
This syntax works outside of classes as well. From the documentation: d - the argument is treated as an integer, and presented as a (signed) decimal number. s - the argument is treated as and presented as a string.
Quite simply, "+=" is a numeric operator and ".=" is a string operator. Consider this example:
$a = 'this is a '; $a += 'test'; This is like writing:
$a = 'this' + 'test'; The "+" or "+=" operator first converts the values to integers (and all strings evaluate to zero when cast to ints) and then adds them, so you get 0.
If you do this:
$a = 10; $a .= 5; This is the same as writing:
$a = 10 . 5; Since the "." operator is a string operator, it first converts the values to strings; and since "." means "concatenate," the result is the string "105".
157
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
