what is difference between ->, =>,<=,<- ?

[nirmalsingh]

hi experts,

i am new to php, i am confused with these syntax in codings, kindly explain me this with example.

[ronverdonk]

Where did you find these? <= and <-
Besides, since you are already using command $t->set_block in an earlier thread, I can assume that you know what you have been coding.
Also, I will not hurry to reply.

Ronald :cool:

[Atli]

I've never come across <- before, not sure if it even exists.

But the -> is used with classes. Simular to C++'s class::func or C#'s class.func, in php its like this:

[PHP]
$Myclass -> MyFunction()
$Myclass -> MyVariable;[/PHP]
The => and <= are mostly used in boolean statments, like if statments or loops,
Few examples:

[PHP]if(0 => 1){} // Greater or equal to, evaluates true in this case.

for($x=0; $x <= 10; $x++){} // Less or equal to, runs 11 times[/PHP]

=> is also used with foreach() statments where you want the use the loop index.
That is:

[PHP]foreach($MyArra y as $x => $var){}
// $x is the index, $var is the value [/PHP]

I cant remeber any more at the moment :P

Hope this answers your question

[nirmalsingh]

I've never come across <- before, not sure if it even exists.

But the -> is used with classes. Simular to C++'s class::func or C#'s class.func, in php its like this:

[PHP]
$Myclass -> MyFunction()
$Myclass -> MyVariable;[/PHP]
The => and <= are mostly used in boolean statments, like if statments or loops,
Few examples:

[PHP]if(0 => 1){} // Greater or equal to, evaluates true in this case.

for($x=0; $x <= 10; $x++){} // Less or equal to, runs 11 times[/PHP]

=> is also used with foreach() statments where you want the use the loop index.
That is:

[PHP]foreach($MyArra y as $x => $var){}
// $x is the index, $var is the value [/PHP]

I cant remeber any more at the moment :P

Hope this answers your question

that wat i needed thank u atli.

[ronverdonk]

As an add-on:
=> is, besides its use as a comparison operator in 'equal or lower then') also used in arrays to assign a key to a value. That is what the foreach in the previous post also does. It is not a foreach rule, but distinguishing a key and its value, such as in statement:

$array = array('abc' => 'def', '0' => 'value');

where 'abc' and '0' are the keys in the array and 'def' and 'value' are their values.

Ronald :cool: