Title: Warning: in_array() [function.in-array]: Wrong datatype for first argument in .. Last modified: August 19, 2016 --- # Warning: in_array() [function.in-array]: Wrong datatype for first argument in .. * [Fabrizio Pivari](https://wordpress.org/support/users/pivari/) * (@pivari) * [16 years ago](https://wordpress.org/support/topic/warning-in_array-functionin-array-wrong-datatype-for-first-argument-in/) * I’ve just installed to test 3.0 beta 2 and everything seems to work good but when I want to see a post e.g. [http://www.pivari.com/video/giudice-di-pace-online-lo-stato-del-procedimento/](http://www.pivari.com/video/giudice-di-pace-online-lo-stato-del-procedimento/) I can see correctly the page but the error is Warning: in_array() [function.in- array]: Wrong datatype for first argument in /usr/local/share/doc/vhost/pivari. com/httpdocs/wp-includes/canonical.php on line 180 * Suggestion? Viewing 15 replies - 1 through 15 (of 15 total) * Moderator [Ipstenu (Mika Epstein)](https://wordpress.org/support/users/ipstenu/) * (@ipstenu) * 🏳️‍🌈 Advisor and Activist * [16 years ago](https://wordpress.org/support/topic/warning-in_array-functionin-array-wrong-datatype-for-first-argument-in/#post-1495796) * Do you get this error using another theme? * Thread Starter [Fabrizio Pivari](https://wordpress.org/support/users/pivari/) * (@pivari) * [16 years ago](https://wordpress.org/support/topic/warning-in_array-functionin-array-wrong-datatype-for-first-argument-in/#post-1495906) * I’ve tried with Arthemia 1.0, iBlue, WordPress Classic 1.5 and Twenty Ten 1.0 and I have the same error. * Fabrizio * Moderator [Ipstenu (Mika Epstein)](https://wordpress.org/support/users/ipstenu/) * (@ipstenu) * 🏳️‍🌈 Advisor and Activist * [16 years ago](https://wordpress.org/support/topic/warning-in_array-functionin-array-wrong-datatype-for-first-argument-in/#post-1495921) * 1) Are you sure you uploaded everything when you upgraded? * 2) What plugins are you using? * Thread Starter [Fabrizio Pivari](https://wordpress.org/support/users/pivari/) * (@pivari) * [16 years ago](https://wordpress.org/support/topic/warning-in_array-functionin-array-wrong-datatype-for-first-argument-in/#post-1495922) * 1) I’ve deleted wp-admin and wp-includes and I’ve copy over the new installation. Then I made upgrade db * 2) I had the same problem with my site [http://www.payperaction.us/](http://www.payperaction.us/) This is a “test” site and has less plugins * The plugins I use are * All in One SEO Pack Contact Form 7 Google XML Sitemaps One Click Plugin Updater Really Simple CAPTCHA WordPress Database Backup * I re-install 2.9.2 and everything works good. If you need I can re-install 3.0 beta2 and give you an admin user to see inside. * fabrizio (at) pivari dot com * Moderator [Ipstenu (Mika Epstein)](https://wordpress.org/support/users/ipstenu/) * (@ipstenu) * 🏳️‍🌈 Advisor and Activist * [16 years ago](https://wordpress.org/support/topic/warning-in_array-functionin-array-wrong-datatype-for-first-argument-in/#post-1495925) * That’s really weird. I have two sites on 3.0-beta2 without errors. * Can you try the latest nightly? [http://wordpress.org/download/nightly/](http://wordpress.org/download/nightly/) Maybe they’ve fixed it. * Thread Starter [Fabrizio Pivari](https://wordpress.org/support/users/pivari/) * (@pivari) * [16 years ago](https://wordpress.org/support/topic/warning-in_array-functionin-array-wrong-datatype-for-first-argument-in/#post-1495926) * The latest nightly doesn’t fix the problem [http://www.payperaction.us/maleva/distribuzione-comunicati-stampa/](http://www.payperaction.us/maleva/distribuzione-comunicati-stampa/) * Thread Starter [Fabrizio Pivari](https://wordpress.org/support/users/pivari/) * (@pivari) * [16 years ago](https://wordpress.org/support/topic/warning-in_array-functionin-array-wrong-datatype-for-first-argument-in/#post-1495927) * I deactivate every plugin and use a default thema and nothing changes. I think I was wrong in the update o there is something strange in the db. * I’ve php 4 and old mysql. * Moderator [Ipstenu (Mika Epstein)](https://wordpress.org/support/users/ipstenu/) * (@ipstenu) * 🏳️‍🌈 Advisor and Activist * [16 years ago](https://wordpress.org/support/topic/warning-in_array-functionin-array-wrong-datatype-for-first-argument-in/#post-1495928) * WP needs PHP 4.3 and MySQL 4.1.2 * Check if you have those? * [Aaron Ross Powell](https://wordpress.org/support/users/aaronpowell/) * (@aaronpowell) * [16 years ago](https://wordpress.org/support/topic/warning-in_array-functionin-array-wrong-datatype-for-first-argument-in/#post-1495935) * I’ve ran into exactly the same problem. Weird thing was, I’m running 3.0 on two different sites and I see it on one, but not the other. Then I realized that my server was setup to use PHP 4 on one domain and PHP 5 on the other. It was the site running 4 that had the error message. I switched it to 5 and the message went away. * Thread Starter [Fabrizio Pivari](https://wordpress.org/support/users/pivari/) * (@pivari) * [16 years ago](https://wordpress.org/support/topic/warning-in_array-functionin-array-wrong-datatype-for-first-argument-in/#post-1495948) * I can’t switch to PHP 5 🙁 Can you fully support PHP 4? * Moderator [Ipstenu (Mika Epstein)](https://wordpress.org/support/users/ipstenu/) * (@ipstenu) * 🏳️‍🌈 Advisor and Activist * [16 years ago](https://wordpress.org/support/topic/warning-in_array-functionin-array-wrong-datatype-for-first-argument-in/#post-1495949) * Which version of 4 are you using? * If it’s **less than** 4.3, you’re out of luck. * Thread Starter [Fabrizio Pivari](https://wordpress.org/support/users/pivari/) * (@pivari) * [16 years ago](https://wordpress.org/support/topic/warning-in_array-functionin-array-wrong-datatype-for-first-argument-in/#post-1495962) * ISP tells me php 4.4! * 🙂 * Moderator [Ipstenu (Mika Epstein)](https://wordpress.org/support/users/ipstenu/) * (@ipstenu) * 🏳️‍🌈 Advisor and Activist * [16 years ago](https://wordpress.org/support/topic/warning-in_array-functionin-array-wrong-datatype-for-first-argument-in/#post-1495963) * Okay, that should work, and if not, it should ping when you try and upgrade. * Raise an issue in the Trac: [http://codex.wordpress.org/Reporting_Bugs](http://codex.wordpress.org/Reporting_Bugs) * [Peter Westwood](https://wordpress.org/support/users/westi/) * (@westi) * [16 years ago](https://wordpress.org/support/topic/warning-in_array-functionin-array-wrong-datatype-for-first-argument-in/#post-1495970) * I’ve committed what I believe is a fix for this to make the new code PHP4 compatible and this will be available in the next nightly build to test out. * The version number for that build will be 3.0-beta2-14697 * Please report back on the ticket how you get along with this. * Cheers * [Usman Latif](https://wordpress.org/support/users/fitalnamsu/) * (@fitalnamsu) * [16 years ago](https://wordpress.org/support/topic/warning-in_array-functionin-array-wrong-datatype-for-first-argument-in/#post-1495977) * I had the same problem. Its now resolved after upgrading to the latest beta version. * Thanks Westi. Viewing 15 replies - 1 through 15 (of 15 total) The topic ‘Warning: in_array() [function.in-array]: Wrong datatype for first argument in ..’ is closed to new replies. * In: [Alpha/Beta/RC](https://wordpress.org/support/forum/alphabeta/) * 15 replies * 5 participants * Last reply from: [Usman Latif](https://wordpress.org/support/users/fitalnamsu/) * Last activity: [16 years ago](https://wordpress.org/support/topic/warning-in_array-functionin-array-wrong-datatype-for-first-argument-in/#post-1495977) * Status: not resolved ## Topics ### Topics with no replies ### Non-support topics ### Resolved topics ### Unresolved topics ### All topics