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run code in 300+ PHP versions simultaneously
<?php $data = array( 'secret' => 'value_secret', 'response' => 'value_response', ); echo ini_get('arg_separator.output') ."\n"; echo http_build_query($data) ."\n"; echo http_build_query($data, null, '&') ."\n";
Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
& secret=value_secret&response=value_response Deprecated: http_build_query(): Passing null to parameter #2 ($numeric_prefix) of type string is deprecated in /in/gCrMb on line 9 secret=value_secret&response=value_response
Output for 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30
& secret=value_secret&response=value_response secret=value_secret&response=value_response

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154.15 ms | 408 KiB | 5 Q