How to Dynamically Assign Variant Object Property Names in PHP

PHP Dynamic Object Property Name Assignment

When working with PHP objects, you may encounter scenarios where specific object properties are defined with different names. For instance, consider the following situation where property names are prefixed with field_name:

$obj->field_name_cars[0];
$obj->field_name_clothes[0];

However, if you have numerous such property names, defining them statically becomes cumbersome. You may consider dynamically assigning property names during runtime to simplify this process. However, the straightforward approach of using the following syntax will result in errors:

$obj-> $field[0];

To dynamically access properties with varying names, you need to enclose the property name within curly braces:

$obj->{$field}[0]

This "enclose with braces" technique provides clarity and ensures that the PHP parser correctly interprets the property access expression. The braces explicitly indicate that the expression within them represents the property name, resolving any potential ambiguity.

In PHP 7.0 and later, this behavior has been improved, and the code above will now work as expected without the need for curly braces. However, using curly braces remains a reliable approach for ensuring consistent behavior across different PHP versions.

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