How Can I Pass Arrays in Query Strings?

Passing Arrays in Query Strings

Passing arrays through query strings is not a standardized practice. Despite this, various techniques can be employed to simulate array behavior.

Standard Syntax:

While there is no definitive standard, using square brackets in the parameter name (e.g., myarray[]) is a common approach that allows PHP to interpret the values as an array.

Multi-Value Form Fields:

1. Use a multiple-select box with name[]= syntax:

   <select multiple="multiple" name="cars[]">
     <option>Volvo</option>
     <option>Saab</option>
     <option>Mercedes</option>
   </select>

2. Use multiple hidden fields with the same name:

   <input type="hidden" name="cars[]" value="Volvo">
   <input type="hidden" name="cars[]" value="Saab">
   <input type="hidden" name="cars[]" value="Mercedes">

Recognizing Arrays in Code:

PHP:

If the parameter name follows the [] syntax, PHP will automatically convert it into an array.

JavaScript:

There is no native way to identify arrays in query strings. However, it's possible to manually check the presence of multiple values with the same name:

const queryString = window.location.search;
const params = new URLSearchParams(queryString);

if (params.has("myarray")) {
  // It's an array
}

Naming Multiple Params:

Using multiple parameters with the same name is acceptable but not recommended. It's not a standard practice and may cause confusion, especially if the parameters are used in multiple contexts.

Delimiting Values:

If maintaining the order of items is crucial, consider passing a delimited string and parsing it manually into an array.

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