Regarding if statements in PHP

I’ve seen some PHP statements that go something like

 if($variable) {} or
 if(function()) {} (if statements that don't compare two variables)

and I know they roughly mean if a function executes or if this variable exists but I can’t seem to find any information on how they work specifically. Can anybody shed some light on this?

Here is Solutions:

We have many solutions to this problem, But we recommend you to use the first solution because it is tested & true solution that will 100% work for you.

Solution 1

if(function()) {} means if the function function‘s return value is true or true-like then the block will execute.

Solution 2

From the PHP manual:

if (expr)
statement

As described in the section about
expressions, expression is evaluated
to its Boolean value. If expression
evaluates to TRUE, PHP will execute
statement, and if it evaluates to
FALSE – it’ll ignore it.

So, if a function successfully runs (true) or a variable exists (true) the if statement will continue. Otherwise it will be ignored.

Solution 3

If a variable is equal to a number which is not zero, that’s considered as true.
as well as if the function returns a positive/negative number which is different from 0.

Solution 4

The if statements determine whether the given variable is true or a given function returns true. A variable is considered “true” if it isn’t null, false, 0, or (perhaps) an empty string.

Solution 5

When PHP evaluates if statements, it is determining whether or not the contents are true. It considers anything other than 0 to be true, and 0 to be false. This means you can put a function in there that returns anything and based on that it will determine whether or not to execute the contents of the if block.

Solution 6

something that may help. You are probably thinking of something like if ($variable < 10), or if ($variable == ‘some value’). Just like +, -, /, *, and % these are operators. 1 + 3 returns a value of 4 which is used in the rest of a standard statement. 1 < 3 returns a value of false which is used in the rest of the statement. the if-method accepts a boolean parameter, and executes code if that boolean parameter is true.

notice that:

if (1 < 3) { ... }

is the same as

$myComparison = 1 < 3;
if ($myComparison) { ... }

Note: Use and implement solution 1 because this method fully tested our system.
Thank you 🙂

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

Leave a Reply