How to construct a string using the keys of an array?

Question

I need help in constructing a string concatenated using comma based on the key values of an array. It could be achieved using foreach loop, but is there any method similar to using implode() ?

This is the sample array I use,

array(5) { 
    [2280]=> string(1) "1" 
    [2138]=> string(1) "1" 
    [3194]=> string(1) "1" 
    [2396]=> string(1) "1" 
    [2944]=> string(1) "1" 
}

Thanks in advance !!!

Félix Adriyel Gagnon-Grenier · Accepted Answer · 2015-02-03 14:00:41Z

4

say your array is named $array, you can do it like that:

implode(',',array_keys($array))

array_keys will return the keys of your array in another array, which will then be used to implode the keys into the string you want.

that would generate the following string:

"2280,2138,3194,2396,2944"

answered Feb 3, 2015 at 14:00

Félix Adriyel Gagnon-Grenier

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Ron van der Heijden · Accepted Answer · 2015-02-03 14:00:59Z

1

Can be done like:

echo implode(', ', array_keys(array(2280 => '1', 2138 => '1')));

Output:

2280, 2138

answered Feb 3, 2015 at 14:00

Ron van der Heijden

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