How to convert a string with comma separated values into variables in php?

Question

For instance, suppose I had 3 columns in my database: column1, column2, column3

And I had 3 variables with the same name as that of the columns:

$column1 = 'Column 1 value';
$column2 = 'Column 2 value';
$column3 = 'Column 3 value';

So if I appended a '$' sign to the column names in a foreach loop, I'll get the variable names.

$string = "column1, column2, column3";

function get_variable_names($string) {
    $array = explode(", ", $string); // Convert to array

    foreach ($array as $key => $value) {
        $array_values_with_dollar[] = '$'.$value;
    }
    $imploded = implode(", ", $array_values_with_dollar); // Convert to string again
    return $imploded;
}

$variable_string = get_variables($string);

Now, the value of $variable_string would be: $column1, $column2, $column3. (string).

Would it be possible to output the real value of the variables such that:

$variable_string => Column 1 value, Column 1 value, Column 1 value

[ without using eval() ]

Chin Leung · Accepted Answer · 2017-07-21 19:43:15Z

3

You can call them like this:

echo ${'column1'};

So if you want to do a loop:

for($i=1; $i<=3; $i++)
    echo ${'column' . $i} . '<br>';

If you want it with a foreach, you can do it like this:

$string = 'column1, column2, column3';
$variables = explode(', ', $string);

foreach($variables as $variable)
    echo $$variable . '<br>';

Result

Column 1 value
Column 2 value
Column 3 value

For more information: http://php.net/manual/en/language.variables.variable.php

answered Jul 21, 2017 at 19:43

Chin Leung

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2 Comments

user3768564 Over a year ago

How to return add $$variable values to an array? eg.: $name= '1 value'; $date= '2 value'; $email= '3 value'; $string = 'name, date, email'; $variables = explode(', ', $string); $cesta = array(); array_push($cesta, $variables); $G_line = $cesta; $G_line_string=implode("|", $G_line); // return 1 value|2 value|3 value ?????

Chin Leung Over a year ago

@user3768564 Simply use foreach ($variables as $variable) { array_push($cesta, $$variable); }

Accountant م · Accepted Answer · 2017-07-21 19:47:14Z

1

Just use $$ instead of $

$column1 = 'Column 1 value';
$column2 = 'Column 2 value';
$column3 = 'Column 3 value';

$string = "column1, column2, column3";
$array = explode(", ", $string);
foreach ($array as $elemnt){
    echo $$elemnt . "<br>";
}
exit;

outputs

Column 1 value
Column 2 value
Column 3 value

answered Jul 21, 2017 at 19:47

Accountant م

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Comments

vjy tiwari · Accepted Answer · 2017-07-21 20:13:17Z

1

i think , you may use this code

$column1 = 'Column 1 value';
$column2 = 'Column 2 value';
$column3 = 'Column 3 value';

$string = "column1, column2, column3";

function get_variable_names($string) {
    $array = explode(", ", $string);         
    return $array;
}

$variable_array = get_variable_names($string);



foreach($variable_array as $str){
    echo $$str.'<br/>'; 
}

edited Jul 21, 2017 at 20:13

answered Jul 21, 2017 at 20:07

vjy tiwari

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Comments

Andreas · Accepted Answer · 2017-07-21 21:31:50Z

0

Use list to list the variables and explode on delimiter.

List($column1, $column2, $column3) = explode(", ", "column1, column2, column3");

https://3v4l.org/IMAoQ

answered Jul 21, 2017 at 21:31

Andreas

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