Get object name as string on php? - Stack Overflow Example #2 Using get_class() in superclass, Example #3 Using get_class() with namespaced classes, Returns the name of the class of an object. On what basis do some translations render hypostasis in Hebrews 1:3 as "substance?". This is exactly what you want - its a ready to use "copy and drop in" function that echo the name of a given var: HINT The function should return directly in the foreach loop instead of just assigning without interruption. The json_decode () function returns an object by default. It is not possible to use an alias during the runtime. I'm perfectly aware there are many languages that allow this, but that by itself doesn't mean much. ways: 1. PHP - Get object properties by variable - Stack Overflow Parameters value The variable being evaluated. Integers are whole numbers, without a decimal point, like 4195. Be sure to check his post on PHP.net: http://php.net/manual/en/language.variables.php. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. How to help my stubborn colleague learn new ways of coding? methods. In particular, you can use Reflection to get all the properties set in a class, whether static, at run-time, or generated on the go. What exactly are these properties? If you need this for anything but debugging, you're doing something severely wrong. The array solution works but is a little convoluted to type when it is needed. Unlike function and class names, variable names are case-sensitive. I'm not advocating to loop over unknown names. rev2023.7.27.43548. rev2023.7.27.43548. PHP: Objects and references - Manual Don't do this. So wanted to add my own way. To learn more, see our tips on writing great answers. Has these Umbrian words been really found written in Umbrian epichoric alphabet? NULL is a special type that only has one value: NULL. The syntax to create an Object Variable variable is as follows: Where `$obj` is the object, and `$varname` is the name of the variable. So the identity comparison yields true for equals scalar values ($a = 'foo'; $b = 'foo'; assert($a === $b);)? Why! Notice the useful ReflectionObject::getProperties() method - it allows you to get all properties set in a class (and you can filter by public, protected, private etc if needed). __get looks up the name in the field array and returns the correct value. PHP Arrays - W3Schools Most languages I've come across have some way of doing this, usually simple. violates the LoD. Not the answer you're looking for? php use object property value as variable variable name, PHP access object values dynamically by variable name, PHP accessing deeper object properties through string variable. I don't like hacks like this, but as long as PHP doesn't have an alternative, this is what has to be done: With regard to getting the class name from a namespaced class name, then using basename() seems to do the trick quite nicely. Eliminative materialism eliminates itself - a familiar idea? Can I use the door leading from Vatican museum to St. Peter's Basilica? Like C++ and Java, PHP also supports object oriented programming. A class is defined by using the class Is the DC-6 Supercharged? gtm.element.dataset.name). In your case it would look something like this: Both previous answers have the "try it, if it doesn't work, move on" and are working for a very specific situation. How do I remove a property from a JavaScript object? If you will type print_var_name($foobar) what's so hard (and different) about typing print("foobar") instead? Object in PHP | Creating and Constructing Object | Methods - EDUCBA rev2023.7.27.43548. Would fixed-wing aircraft still exist if helicopters had been invented (and flown) before them? 6. Continuous Variant of the Chinese Remainder Theorem. I have object properties in my code that look like this: The problem is I have 100s of field names and need to write the property name dynamically. Find centralized, trusted content and collaborate around the technologies you use most. Here is an example: Read more in How to get a variable name as a string in PHP? I might have been a little unclear ($type = 'print') This solved my problem though: "$query = $this->Queryparts->{$type}['filter'];" I am not sure how your first example would be used in my case. // @todo Drop the connection to the database. What does it mean in terms of energy if power is increasing with time? 01. What you are doing is essentially trying variables at random - this works fine for 20 variablesbut imagine 500? Why is an arrow pointing through a glass of water only flipped vertically but not horizontally? I wanted to be able to do the following: log($didTheSystemBlowUp); To appear in the log file like: $didTheSystemBlowUp = 'not yet, but very soon'; Also this can be useful when calling var_dump() so when you call at same time on several variables you have not manually output var name to distinguish between outputs of vardupms. How to return an Array's "name" as a String. PHP | Classes - GeeksforGeeks PHP OOP - Classes and Objects - W3Schools Result of testing on my ubuntu 18.04 with php 7.2.19: Does not work when used multiple times on the same line of code, irrespective if it is used in one or separate expressions, because then it returns the name of the last variable of the line. I agree with those who question its use otherwise. 594), Stack Overflow at WeAreDevelopers World Congress in Berlin, Temporary policy: Generative AI (e.g., ChatGPT) is banned, Preview of Search and Question-Asking Powered by GenAI, Assigning dynamic values to object properties in PHP. A class should not have a variable number of properties and properties should not be enumerated collections. Find centralized, trusted content and collaborate around the technologies you use most. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Though I think using an array instead of the object would be a better solution. This anecdote could be improved, by showing small snippets of code. Renaming variables to better suit their purpose is a very common refactoring practice, and the whole point is that it doesn't make any difference. Printing a label is very useful then. I don't doubt there are justifiable cases, and that's why I was wondering about proper use cases for it. Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Talent Build your employer brand ; Advertising Reach developers & technologists worldwide; Labs The future of collective knowledge sharing; About the company php - How to set properties of an object dynamically, from a variable Kudos to Sebastin and anyone else that may have contributed to this answer. (with no additional restrictions), My sink is not clogged but water does not drain, Single Predicate Check Constraint Gives Constant Scan but Two Predicate Constraint does not. +1 - I needed this for auto-generating XML or JSON response from a model PHP object. To learn more, see our tips on writing great answers. And what is a Turbosupercharger? Without the where clause it would be like looking for a . In PHP, Object Variable variables allow variables to be treated as objects. Obviously this will not always work, since different variables often have the same values, but it's the only way I can think of to do this. Thanks for contributing an answer to Stack Overflow! $GLOBALS seems to work so I've changed it to that. The code in my previous comment was not completely correct. Introduction to Object in PHP. Asking for help, clarification, or responding to other answers. The braces allow you to be explicit. A far more useful piece of information is where in your code the debug function was called from. How to get the property name used by outer-object for inner-object from the inner-object in PHP, Getting the name of a stdClass object in PHP. Can a judge or prosecutor be compelled to testify in a criminal trial in which they officiated? What exactly are these properties? PHP has a total of eight data types which we use to construct our variables . Right there in your example you actually CREATE a variable, Cool, thanks for this. ($name and $color) and two methods set_name() and $this is the value of the calling object. Return Values It is possible that I was doing something wrong in the way I was using dynamic object properties. I posted a simplified version of this code there. It's, New! One of the big differences between functions and classes is that a class contains both data (variables) and functions that form a package called an: 'object'. Not the answer you're looking for? Are self-signed SSL certificates still allowed in 2023 for an intranet server running IIS? WW1 soldier in WW2 : how would he get caught. 6 . Did active frontiersmen really eat 20,000 calories a day? PHP Variables - W3Schools PHP Object Variable variables name? - Glasshost Which generations of PowerPC did Windows NT 4 run on? I misunderstood the question. Sure, I could continue to do cache('colour', $colour), but I'm lazy, you know ;). are created, they inherit When a class is defined, we can create many objects out of the class. Otherwise, the object name and the keys for the property will always be the same. Eliminative materialism eliminates itself - a familiar idea? 594), Stack Overflow at WeAreDevelopers World Congress in Berlin, Temporary policy: Generative AI (e.g., ChatGPT) is banned, Preview of Search and Question-Asking Powered by GenAI, get element from an array as a field name in PHP, PHP - Use variable names with numbers through a loop. Late static bindings are explained here: If you want the Class Name without the Namespace or if you've got here because basename() returns a dot (.) How can Phones such as Oppo be vulnerable to Privilege escalation exploits, "Pure Copyleft" Software Licenses? For whatever reason you would find yourself in a situation like this, it does actually work. rev2023.7.27.43548. You can reference arrays by index numerically or non-numerically. In cases where the (now improved) default behavior is undesired, curly braces can still be used to override it as shown below. That's my use case and yes, it does have to do with debugging. A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9 . A namespace or a class is determined by its complete path, starting from the root namespace. Thanks for contributing an answer to Stack Overflow! What is the use of explicitly specifying if a function is recursive or not? Approach 3: Write a function to convert object of the initial class into serialized data using serialize() method. What does it mean in terms of energy if power is increasing with time? Sci fi story where a woman demonstrating a knife with a safety feature cuts herself when the safety is turned off. How do I check if an object has an attribute? And I add a nicer output! Original answer Write the access like this: $obj-> {$field} [0] This "enclose with braces" trick is useful in PHP whenever there is ambiguity due to variable variables. Follow our guided path, With our online code editor, you can edit code and view the result in your browser, Join one of our online bootcamps and learn from experienced instructors, We have created a bunch of responsive website templates you can use - for free, Large collection of code snippets for HTML, CSS and JavaScript, Learn the basics of HTML in a fun and engaging video tutorial, Build fast and responsive sites using our free W3.CSS framework, Host your own website, and share it to the world with W3Schools Spaces. It detects any expression passed as an argument, not only variable names. Get PHP class property by string. 594), Stack Overflow at WeAreDevelopers World Congress in Berlin, Temporary policy: Generative AI (e.g., ChatGPT) is banned, Preview of Search and Question-Asking Powered by GenAI. Is this even possible in PHP? "Sibi quisque nunc nominet eos quibus scit et vinum male credi et sermonem bene", "Pure Copyleft" Software Licenses? # PowerShell $_ Variable Example Get-Service | Where-Object {$_.name -Match "win"} What we want to say here is Get the services, where the service name matches 'Win'. an E_WARNING level error was raised. How to get a variable name as a string in PHP? To access class variables and methods using the self keyword, we use the scope resolution operator :: In case of this operator, we use the -< symbol. generics - PHP: Dynamic Object Names - Stack Overflow When called in a static method, this function returns the name of the class the call was made against. What Is Behind The Puzzling Timing of the U.S. House Vacancy Election In Utah? Edit: get_defined_vars() doesn't seem to be working correctly, it returns 'var' because $var is used in the function itself. Consider the initial code $obj->$field[0] -- does this mean "access the property whose name is given in $field[0]", or "access the element with key 0 of the property whose name is given in $field"? A class is a template for objects, and an object is an instance Variable Names. I've also tried using $template->${$field_name} and $template->$$field_name but so far no luck! Making statements based on opinion; back them up with references or personal experience. However, you can use the result of get_defined_vars(), which returns all the variables defined in the scope, including name and value. Note that closures return true when passed to is_object(): I'm not even sure how to articulate this, so I'm going to just include test code. Are arguments that Reason is circular themselves circular and/or self refuting? The data looks as follows: What I need to do with that data is set properties of a $template object according to the field column and set said values to what's in the content column; e.g. What is the use of explicitly specifying if a function is recursive or not? Finds whether the given variable is an object. That's pretty substantial. To create a variable in JavaScript, use the let keyword. If a class implements ArrayAccess , Countable , and one of the iterator interfaces, it's mostly indistinguishable from a normal array() I used this function in a parent class to get the name of the class that extends it. Unserializes data as returned by the standard PHP serialize() function. I need to extract the object names as string like this: You have several way to print a a class name in php: get_class: Returns the name of the class of an object. This approach can only be used if initial class contains only variables as members. // You have to overload the getInstance method in each extended class: Note that the constant __CLASS__ is different from get_class($this) : Take care using the backtrace method to find the calling class of a static method, you should step backward through the array and find a match for your getInstance() function. Echoing the same variable variable using the function that created it results in the same return and therefore the same variable name is used in the echo statement. How can Phones such as Oppo be vulnerable to Privilege escalation exploits. // this method is count($bt)-1) by Frederik will fall over when calling getInstance from within an include file. Maybe someone else will someday wonder the same thing. This example is especially scary as it throws an exception which can cause serious app-breaking behaviour if the developer isn't planning on accessing a nonexistent attribute to throw an exception, turning a simple attribute access into a potential fatal error. Is the DC-6 Supercharged? @b01 I've done plenty. Help the lynx collect pine cones, Join our newsletter and get access to exclusive content every month. There are two OverflowAI: Where Community & AI Come Together, Behind the scenes with the folks building OverflowAI (Ep. They come from using SimpleXMLEement to process an XML file that has code like:
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