Title: PHP Warning: Array to string conversion
Last modified: May 26, 2022

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# PHP Warning: Array to string conversion

 *  Resolved [Ilir](https://wordpress.org/support/users/ipruthi/)
 * (@ipruthi)
 * [3 years, 10 months ago](https://wordpress.org/support/topic/php-warning-array-to-string-conversion/)
 * Hello WPMU DEV,
 * I would like to first say that I enjoy using the Hummingbird plugin for caching.
 * I’m receiving a **PHP Warning: Array to string conversion** for code located 
   in `hummingbird-performance/core/modules/minify/class-minify-group.php` line 
   959.
 * The code is:
    `$hash .= implode( '-', $handles_versions );`
 * $handles_versions is probably a multi-dimensional array that is being imploded
   and PHP doesn’t like that, even though it doesn’t throw out an error.
 * Hopefully you can address this in your next version.
 * Thanks!
 * -Ilir

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Plugin Support [Patrick – WPMU DEV Support](https://wordpress.org/support/users/wpmudevsupport12/)
 * (@wpmudevsupport12)
 * [3 years, 10 months ago](https://wordpress.org/support/topic/php-warning-array-to-string-conversion/#post-15683288)
 * Hi [@ipruthi](https://wordpress.org/support/users/ipruthi/)
 * I hope you are doing well.
 * We are happy to hear you enjoy using our plugin, our developers work hard to 
   keep improving it with every new release.
 * I couldn’t find a known but I did find a similar case in the past, this happened
   because a plugin Sendinblue in that case was passing a wrong version parameter
   which was causing the error, for that case we fixed using this script [https://gist.github.com/wpmudev-sls/dd4b1ebc4a98ea404129c1d1d7fc2616](https://gist.github.com/wpmudev-sls/dd4b1ebc4a98ea404129c1d1d7fc2616)
 * In case you don’t use this plugin, could you try a full plugin conflict test 
   to verify if any other plugin is causing the same behaviour?
 * Test workflow is found at: [https://wpmudev.com/wp-content/uploads/2015/09/Support-Process-Support-Process.gif](https://wpmudev.com/wp-content/uploads/2015/09/Support-Process-Support-Process.gif)
 * Best Regards
    Patrick Freitas
 *  Plugin Support [Nithin – WPMU DEV Support](https://wordpress.org/support/users/wpmudevsupport11/)
 * (@wpmudevsupport11)
 * [3 years, 9 months ago](https://wordpress.org/support/topic/php-warning-array-to-string-conversion/#post-15742860)
 * Hi [@ipruthi](https://wordpress.org/support/users/ipruthi/),
 * Since we haven’t heard from you for a while. I’ll mark this thread as resolved
   for now. Please feel free to re-open the thread if you need further assistance.
 * Best Regards
    Nithin

Viewing 2 replies - 1 through 2 (of 2 total)

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## Tags

 * [array](https://wordpress.org/support/topic-tag/array/)
 * [implode](https://wordpress.org/support/topic-tag/implode/)
 * [PHP Warning](https://wordpress.org/support/topic-tag/php-warning/)

 * 2 replies
 * 3 participants
 * Last reply from: [Nithin – WPMU DEV Support](https://wordpress.org/support/users/wpmudevsupport11/)
 * Last activity: [3 years, 9 months ago](https://wordpress.org/support/topic/php-warning-array-to-string-conversion/#post-15742860)
 * Status: resolved