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What's the difference between those PHP if expressions!?
if ($var !== false)
{
// Do something!
}
if (false !== $var)
{
// Do something!
}
Some frameworks like Zend Framework uses the latest form while the traditional is the first.
Thanks in advance
482
if statement - executes some code if one condition is true. if...else statement - executes some code if a condition is true and another code if that condition is false. if...elseif...else statement - executes different codes for more than two conditions. switch statement - selects one of many blocks of code to be ...
In PHP, regular expressions are strings composed of delimiters, a pattern and optional modifiers. $exp = "/w3schools/i"; In the example above, / is the delimiter, w3schools is the pattern that is being searched for, and i is a modifier that makes the search case-insensitive.
In programming language terminology, an “expression” is a combination of values and functions that are combined and interpreted by the compiler to create a new value, as opposed to a “statement” which is just a standalone unit of execution and doesn't return anything.
== Operator: This operator is used to check the given values are equal or not. If yes, it returns true, otherwise it returns false. === Operator: This operator is used to check the given values and its data type are equal or not. If yes, then it returns true, otherwise it returns false.
The result of the expression is the same however it's a good way of protecting yourself from assigning instead of comparing (e.g writing if ($var = false) instead of if ($var == false), since you can't assign the value $var to the false keyword)
89
It's just a preference really. You can put it either way, a == b or b == a, but it's easier to make a mistake if you do
if ($var == false)
because if you accidentally type it with one = letter, the condition will always equal to true (because $var will be set successfully), but in case of
if (false == $var)
if you now put in =, you will get an error.
38
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