var_dump() vs. print_r(): When Should You Use Each for Array Output?

Demystifying var_dump() and print_r(): Unveiling the Differences in Array String Output

var_dump() and print_r() are two invaluable PHP functions that provide detailed information about variables, including arrays. While they share the purpose of outputting arrays as strings, they exhibit subtle differences in their approach.

var_dump(): Unveiling Structured Information

var_dump() delves into the depths of a variable's structure, providing comprehensive details on its type and value. When dealing with arrays, it recursively explores their contents, indenting values to showcase their hierarchical relationships. Moreover, it highlights referencing information, identifying which elements and object properties are interconnected.

print_r(): Human-Readable Array Representation

On the other hand, print_r() focuses on producing an array string that is easily digestible for humans. It prioritizes clarity by presenting values along with their keys and elements. Objects are also represented using a similar notation, ensuring readability.

Illustrative Example

Consider the following object:

<code class="php">$obj = (object) array('qualitypoint', 'technologies', 'India');</code>

Executing var_dump($obj) yields the following output:

object(stdClass)#1 (3) {
 [0]=> string(12) "qualitypoint"
 [1]=> string(12) "technologies"
 [2]=> string(5) "India"
}

In contrast, print_r($obj) produces this output:

stdClass Object ( 
 [0] => qualitypoint
 [1] => technologies
 [2] => India
)

As demonstrated, var_dump() discloses the object's internal structure, including its class name (stdClass) and numerical index. print_r(), on the other hand, simplifies the presentation by displaying the object properties along with their values.

Additional Resources

For further insights into these functions, refer to the following:

• var_dump
• print_r

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