CODEWITHSUNDEEP
phparraysstring
fdv
fdv

Reputation: 3

Value of associative array element not recognized as string

The var_dump of the associative array $myArray is as follows:

array (size=522)
  0 => 
    array (size=3)
      'id' => int 1
      'url' => string 'introduction' (length=12)
      'title' => string 'Introduction' (length=12)
  1 => 
    array (size=3)
      'id' => int 2
      'url' => string 'first_steps' (length=11)
      'title' => string 'First steps' (length=11)
  2 => ...

When I assign the values of elements in the associative array to a function, to perform some string manipulation, I get an error:

"Catchable fatal error: Argument 1 passed to doStringManipulation() must be an instance of string, string given, ..."

The string manipulation is called inside a foreach loop:

foreach($myArray as $row){
    ...
    $s = doStringManipulation((string) $row['url']); // triggers error
    ...
}

function doStringManipulation(string str){
    ...
    return $result; // string
}

Whether or not I cast $row['url'] to string doesn't make a difference. I always get the error, even though var_dump confirms that the element value is a string.

What am I missing here?

Thanks!

Upvotes: 0

Views: 118

Answers (2)

Robert
Robert

Reputation: 5973

I'm going to assume you're not using php 7.

The error states that it requires an instance of string (which php does not have), this is because you are type hinting string in function doStringManipulation(string str){. Type hinting does not work on anything but on arrays and objects.

My suggestion:

function doStringManipulation($str) { // assuming 'str' was a typo here
    if ( ! is_string($str)) {
         return '';
    }

    ...

    return $result; // string
}

For more info see: http://php.net/manual/en/migration70.new-features.php

Upvotes: 1

Bukharov Sergey
Bukharov Sergey

Reputation: 10185

You use php version 5.0-5.6. you cant specify string as function argument. Code must looks like

/**
* @var String str
*/ 
function doStringManipulation(str){
    ...
    return $result; // string
}

Or update php up to 7

Upvotes: 0

Related Questions