yumna12-coder's avatar

Casting

protected $casts = [ 'Is_trend' => 'boolean', ];

{{ $product->Is_trend }}

Why does this print 0 instead of false?

I thought that casting means converting the attribute’s type into another type. So if Is_trend is cast to boolean, why is 0 printed in the Blade view?

Also, I’m trying to understand the real benefit of using $casts. What problem does casting actually solve in Laravel

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9 replies
LaryAI's avatar
LaryAI
AI
3 months ago
Level 58

Certainly! Let me address each part of your question:

1. Why does {{ $product->Is_trend }} print 0 instead of false?

Even though you've correctly set the cast:

protected $casts = [
    'Is_trend' => 'boolean',
];

When you use {{ $product->Is_trend }} in your Blade template, Laravel (actually, PHP) converts false to an empty string when echoing unless the value is numeric. However, because of the type juggling in PHP, sometimes false can be displayed as 0 in the view if that's how the underlying data came from the database (integer 0 instead of boolean false).

Blade's {{ ... }} is essentially just a convenient way to echo the value, so it’s subject to how PHP handles "stringifying" values:

  • false (boolean) echoed becomes an empty string.
  • true (boolean) echoed becomes 1.
  • 0 (integer) echoed becomes 0.

Even when Laravel casts an attribute to boolean, because the value is still being echoed, you see 0 and 1 (or just an empty string for false in some PHP versions). To have clearer, more explicit output, you should convert the value yourself:

{{ $product->Is_trend ? 'true' : 'false' }}

Or, for debugging purposes:

{{ var_export($product->Is_trend, true) }}

2. What is the real benefit of $casts? What problem does it solve?

The $casts property on an Eloquent model ensures that, whenever you retrieve an attribute, it's automatically converted to the specified type (integer, boolean, array, datetime, etc.).

Why is this helpful?
Databases store everything as strings or numbers. For instance, if you have a boolean field in MySQL (tinyint(1)), it comes into PHP as 1 or 0 (integers) — not booleans. $casts converts them automatically, so…

  • When you do logic in your PHP code, you can safely use strict checks (like === true), knowing the type will be correct.
  • For JSON columns or dates, you get arrays or Carbon objects right away, so it’s easier and safer to work with them.

Example without casts:

if ($product->Is_trend === true) {
    // Will not be true, since $product->Is_trend is 1, not true
}

Example with casts:

if ($product->Is_trend === true) {
    // Will work as expected!
}

Summary

  • Use $casts for correct data types in your PHP code.
  • Blade’s {{ }} displays 0/1 or an empty string because that's how PHP echoes bools/ints. Use a ternary or var_export() for clearer display in your view.
  • Casting is mainly to make your code more robust (type-safe) and to avoid subtle bugs.

Example for your Blade view:

{{ $product->Is_trend ? 'Yes' : 'No' }}

Or if you want to show the real type/boolean:

{{ var_export($product->Is_trend, true) }}

Let me know if you need more clarifications!

1 like
Glukinho's avatar

Having a cast in a model means model has strict boolean value (true or false) on a field when retrieved from database instead of integer 1 or 0 as stored in a database. It has nothing to do with views rendering, it just helps you keep variables types consistent.

To render boolean values in your views properly use explicit values, like this:

<p>product is trend: {{ $product->is_trend ? 'YES !!!' : 'NO :-(' }}</p>

It will produce HTML:

// if $product->is_trend is true:
<p>product is trend: YES !!!</p> 

// if false:
<p>product is trend: NO :-(</p>
JussiMannisto's avatar

A boolean value isn't a string. When PHP prints a boolean value, true is printed as 1 and false is printed as an empty string. The reasons are historical.

Casting tells Laravel how to convert data between different types when storing or reading them from the database. This is called serialization and deserialization.

A boolean value is often stored as an integer in the database. If you don't use casting, you'll get an integer (0 or 1) when you retrieve it. It's not the correct type and may or may not cause issues. For example, if you're using strict types and a function expects a boolean value:

function foo(bool $bar): void {
... 
}

// Passing an integer throws an error if strict_types is enabled.
foo($model->uncasted_field);

You can cast more than just primitive types. Take this enum, for example:

enum Status: string {
	case Pending = 'pending';
	case Processing = 'processing';
	case Finished = 'finished';
}

With casting, Laravel serializes the status as its string value when stored, then deserializes it back to its enum case when retrieved.

You can use casting to store an array to a column. Laravel serializes the data as a JSON string, e.g. '["foo", "bar", "baz"]', then automatically deserializes it back to an array when retrieved.

You can also write your own custom casts. Overall, casting is a very useful feature.

Snapey's avatar

short answer, because booleans are 0 and 1, not strings of "true" and "false"

JussiMannisto's avatar

@snapey Booleans aren't really 0 or 1, that's just how Blade renders them. If you echo raw boolean values, you'll get 1 or an empty string.

Booleans aren't 0 or 1 in PHP internals either. In fact, boolean isn't even a single type but two separate valueless types. Their meaning is encoded by their zval type, which is either IS_TRUE or IS_FALSE.

Here's how booleans are cast to strings at the language level. I'm not sure exactly what the Blade compiler does, but I bet 0 and 1 are the desired outputs there.

Snapey's avatar

have a look at a boolean logic truth table

JussiMannisto's avatar

I don't get how that's relevant. Boolean values aren't bits in PHP. They're their own separate types with their own type coercion rules.

DigitalArtisan's avatar

When a PHP bool is echo'd, it is automatically type casted to a string.

Now for database storage:

  • PostgreSQL: Has a true, native BOOLEAN data type (1 byte). Accepts values like true/false, yes/no, 1/0, 't'/'f', 'y'/'n', and supports NULL.
  • MySQL: No native boolean type. BOOLEAN/BOOL are aliases for TINYINT(1). Uses 1 for true and 0 for false; any non-zero value evaluates as true.
  • SQLite: No boolean storage class. Uses INTEGER (NUMERIC affinity), where 1 = true and 0 = false. TRUE and FALSE are just aliases for 1 and 0.

Key takeaway: PostgreSQL is SQL-standard with a real boolean type, while MySQL and SQLite represent booleans using integers—important to remember for cross-database compatibility.

PHP stores booleans as booleans, not numbers

  • echo converts them to strings:

    • true → "1"

    • false → ""

Use var_dump() to see the real type

Cast to (int) if you truly want 0 / 1

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