Use php namespace inside function

Question 1

I get a parse error when trying to use a name space inside my own function

require('/var/load.php');

function go(){

  use testClass;

    $go = 'ok';
    return $go;
}

    echo go();

Question 2

From Scoping rules for importing

The use keyword must be declared in the outermost scope of a file (the global scope) or inside namespace declarations. This is because the importing is done at compile time and not runtime, so it cannot be block scoped

So you should put like this, use should specified at the global level

require('/var/load.php');
use testClass;

function go(){
    $go = 'ok';
    return $go;
}
echo go();

Check the example 5 in the below manual Please refer to its manual at http://php.net/manual/en/language.namespaces.importing.php

Question 3

You can't break/continue a loop outside a function, from within a function. However, you can break/continue your loop based on the return value of your function:

function myFunction(){   
    //Do stuff
    return $foo === 'bar';
}


foreach($x as $y) {
    if(myFunction()) {
        continue;
    }

    //Do stuff

    echo $output . '<br>';    
}

Question 4

You need to fully qualify the relative class name Yii.

The most convenient way to do this is by importing the class: just add use Yii; below your namespace declaration.

Question 5

Second option is better if you want to implement some kind of polymorphism or to completely change function's logic. Something like this.

namespace Nkamm;

// like a PHP6
function strstr($needle, $haystack)
{
    return strstr($haystack, $needle);
}

var_dump(strstr('t', 'Long test'));

Result:

string(4) "test"

But I would not like to do such "overloads" because that will cause the mess (until they are strictly documented in project). Hence there is no sense to overwrite existing functions.

Summing up: keep your functions in your namespace, use global functions without any backslashes.

Question 6

Looks like a known issue in PhpStorm.

Use php namespace inside function

Answers

php,function,namespaces

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