instantiate object from strings in array php

Question

I have this array:

$methodsOutput = array("MidUpperArmMuscleArea","ArmSpan_HeightEstimation","BMIBeforePregnancy",
                "PregnancyTotalWeightGain","PregnancyWeeklyWeightGain","MS_CurrentBMI_BMIPregnancyWeeks",
                "PregnancyDueDate","PregnancyWeeks","WeightEstimation","WHO_BMI_2000_IdealBMI",
                "WHO_BMI_2000_IdealWeight","WHO_HeightAge_2006_IdealHeight","WHO_WeightAge_2006_IdealWeight");

and for each one I have the respective class (all included in file).

How can I instantiate dynamically this.

I try this:

foreach($methodsOutput as $method) {
    $$method= new $method();
}

but get:

Fatal error: Class 'MidUpperArmMuscleArea' not found in...

Do NOT use variable variables. Your code becomes an unmaintainable impossible-to-debug mess. — Marc B
– Marc B, Commented Mar 22, 2012 at 17:15
if you get Class '...' not found then the class is not found. No way around it. If you think the class should be found, then test your assumption to be correct. — Yoshi
– Yoshi, Commented Mar 22, 2012 at 17:20
@Yoshi: If I comment the 'foreach' code and put $instance = new MidUpperArmMuscleArea() works. — Munir
– Munir, Commented Mar 22, 2012 at 17:25

Evert · Accepted Answer · 2012-03-22 17:11:05Z

1

Objectively, this looks like a really bad way of doing this..

Anyway, that's not what you want to hear.

The class 'MidUpperArmMuscleArea' must really not exist in that context, as your syntax is correct. Since you mention all these classes are in the same file, are you defining them after you are executing this code?

answered Mar 22, 2012 at 17:11

Evert

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1 Comment

Munir Over a year ago

Sorry all! I am new here and I forgot to check the tag 'Symfony2' in the question. The array should be: $methodsOutput = array("MyProject\MyBundle\Entity\MidUpperArmMuscleArea","MyProject\MyBundle\Entity\ArmSpan_HeightEstimation",...); and now works! but I change this... I will pass this variables in YML file. Thx all! and sorry again.

Cloudson · Accepted Answer · 2012-03-22 17:23:00Z

0

Do you have that class "MidUpperArmMuscleArea" ? You could to use class_exists to test.

answered Mar 22, 2012 at 17:23

Cloudson

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1 Comment

Munir Over a year ago

Realy. The class is 'MyProject\MyBundle\Entity\MidUpperArmMuscleArea'. Cause I am using Symfony2. Thx!

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