Looping through all the properties of object php

How can I loop through all the properties of object?. Right now I have to write a new code line to print each property of object

echo $obj->name;
echo $obj->age;

Can I loop through all the properties of an object using foreach loop or any loop?

Something like this

foreach ($obj as $property => $value)

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最佳答案

If this is just for debugging output, you can use the following to see all the types and values as well.

var_dump($obj);

If you want more control over the output you can use this:

foreach ($obj as $key => $value) {
echo "$key => $value\n";
}

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Here is another way to express the object property.

foreach ($obj as $key=>$value) {
echo "$key => $obj[$key]\n";
}

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For testing purposes I use the following:

//return assoc array when called from outside the class it will only contain public properties and values
var_dump(get_object_vars($obj));

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Sometimes, you need to list the variables of an object and not for debugging purposes. The right way to do it is using get_object_vars($obj). It returns an array that has all the visible class variables and their value. You can then loop through them in a foreach-loop. If used within the object itself, simply do get_object_vars($this).

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Before you run the $obj through a foreach loop you have to convert it to an array (see: cast to array) if you're looking for properties regardless of visibility.

Example with HTML output (PHP 8.1):

foreach ((array)$obj as $key => $val) {
printf(
"%s: %s<br>\n",
htmlspecialchars("$key"),
htmlspecialchars("$val"),
);
}

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David's answer is solid as long as either: a) you only need access to public attributes, or b) you are working with the stdClass object. If you have defined private or protected attributes in a class and want to display all attributes, simply add an instance method that iterates the properties:

class MyClass {


public $public_attr1;
private $private_attr2;
protected $protected_attr3;


function iterateAttributes() {
foreach ($this as $attr=>$value) {
echo "$attr: $value <br/>";
}
}


}