{"id":1116,"date":"2021-04-14T00:33:45","date_gmt":"2021-04-14T00:33:45","guid":{"rendered":"https:\/\/phptutorial.net\/?page_id=1116"},"modified":"2025-04-06T03:49:43","modified_gmt":"2025-04-06T03:49:43","slug":"php-array_reverse","status":"publish","type":"page","link":"https:\/\/www.phptutorial.net\/php-tutorial\/php-array_reverse\/","title":{"rendered":"PHP array_reverse"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the PHP <code>array_reverse()<\/code> function to reverse the order of elements in an array.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='introduction-to-the-php-array_reverse-function'>Introduction to the PHP array_reverse() function <a href=\"#introduction-to-the-php-array_reverse-function\" class=\"anchor\" id=\"introduction-to-the-php-array_reverse-function\" title=\"Anchor for Introduction to the PHP array_reverse() function\">#<\/a><\/h2>\n\n\n\n<p>The <code>array_reverse()<\/code> function accepts an <a href=\"https:\/\/phptutorial.net\/php-tutorial\/php-array\/\">array<\/a> and returns a new array with the order of elements in the input array reversed.<\/p>\n\n\n\n<p>The following shows the <code>array_reverse()<\/code> function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">array_reverse ( <span class=\"hljs-keyword\">array<\/span> $array , bool $preserve_keys = <span class=\"hljs-keyword\">false<\/span> ) : <span class=\"hljs-keyword\">array<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The <code>array_reverse()<\/code> function has two parameters:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>$array<\/code> is the input array<\/li>\n\n\n\n<li><code>$preserve_keys<\/code> determines if the numeric keys should be preserved. If <code>$preserve_keys<\/code> is <code>true<\/code>, the numeric key of elements in the new array will be preserved. The <code>$preserve_keys<\/code> doesn&#8217;t affect the non-numeric keys.<\/li>\n<\/ul>\n\n\n\n<p>The <code>array_reverse()<\/code> doesn&#8217;t change the input array. Instead, it returns a new array.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='php-array_reverse-function-example'>PHP array_reverse() function example <a href=\"#php-array_reverse-function-example\" class=\"anchor\" id=\"php-array_reverse-function-example\" title=\"Anchor for PHP array_reverse() function example\">#<\/a><\/h2>\n\n\n\n<p>The following example uses the <code>array_reverse()<\/code> function to reverse the order of an array:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"HTML, XML\" data-shcb-language-slug=\"xml\"><span><code class=\"hljs language-xml\"><span class=\"php\"><span class=\"hljs-meta\">&lt;?php<\/span>\n\n$numbers = &#91;<span class=\"hljs-number\">10<\/span>, <span class=\"hljs-number\">20<\/span>, <span class=\"hljs-number\">30<\/span>];\n$reversed = array_reverse($numbers);\n\nprint_r($reversed);\nprint_r($numbers);<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">HTML, XML<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">xml<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/phptutorial.net\/playground\/?q=PD9waHAKCiRudW1iZXJzID0gWzEwLCAyMCwgMzBdOwokcmV2ZXJzZWQgPSBhcnJheV9yZXZlcnNlKCRudW1iZXJzKTsKCnByaW50X3IoJHJldmVyc2VkKTsKcHJpbnRfcigkbnVtYmVycyk7\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"plaintext\" data-shcb-language-slug=\"plaintext\"><span><code class=\"hljs language-plaintext\">Array\n(\n    &#91;0] =&gt; 30\n    &#91;1] =&gt; 20\n    &#91;2] =&gt; 10\n)\nArray\n(\n    &#91;0] =&gt; 10\n    &#91;1] =&gt; 20\n    &#91;2] =&gt; 30\n)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">plaintext<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">plaintext<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>How it works.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>First, define an array of three numbers 10, 20, 30.<\/li>\n\n\n\n<li>Then, use the array_reverse() function to create a new array with the order of elements in the <code>$numbers<\/code> array reversed.<\/li>\n\n\n\n<li>Finally, show the reversed array and the $numbers array. As you can see, the $numbers array doesn&#8217;t change.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id='preserving-numeric-keys'>Preserving numeric keys <a href=\"#preserving-numeric-keys\" class=\"anchor\" id=\"preserving-numeric-keys\" title=\"Anchor for Preserving numeric keys\">#<\/a><\/h2>\n\n\n\n<p>The following example uses the <code>array_reverse()<\/code> function to reverse elements of an array. However, it preserves the keys of the elements:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"HTML, XML\" data-shcb-language-slug=\"xml\"><span><code class=\"hljs language-xml\"><span class=\"php\"><span class=\"hljs-meta\">&lt;?php<\/span>\n\n$book = &#91;\n\t<span class=\"hljs-string\">'PHP Awesome'<\/span>,\n\t<span class=\"hljs-number\">999<\/span>,\n\t&#91;<span class=\"hljs-string\">'Programming'<\/span>, <span class=\"hljs-string\">'Web development'<\/span>],\n];\n\n$preserved = array_reverse($book, <span class=\"hljs-keyword\">true<\/span>);\n\nprint_r($preserved);<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">HTML, XML<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">xml<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/phptutorial.net\/playground\/?q=PD9waHAKCiRib29rID0gWwoJJ1BIUCBBd2Vzb21lJywKCTk5OSwKCVsnUHJvZ3JhbW1pbmcnLCAnV2ViIGRldmVsb3BtZW50J10sCl07CgokcHJlc2VydmVkID0gYXJyYXlfcmV2ZXJzZSgkYm9vaywgdHJ1ZSk7CgpwcmludF9yKCRwcmVzZXJ2ZWQpOw\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-keyword\">Array<\/span>\n(\n    &#91;<span class=\"hljs-number\">2<\/span>] =&gt; <span class=\"hljs-keyword\">Array<\/span>\n        (\n            &#91;<span class=\"hljs-number\">0<\/span>] =&gt; Programming\n            &#91;<span class=\"hljs-number\">1<\/span>] =&gt; Web development\n        )\n\n    &#91;<span class=\"hljs-number\">1<\/span>] =&gt; <span class=\"hljs-number\">999<\/span>\n    &#91;<span class=\"hljs-number\">0<\/span>] =&gt; PHP Awesome\n)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\" id='summary'>Summary <a href=\"#summary\" class=\"anchor\" id=\"summary\" title=\"Anchor for Summary\">#<\/a><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the PHP <code>array_reverse()<\/code> function to reverse the order of elements in an array.<\/li>\n\n\n\n<li>Set the <code>$preserve_keys<\/code> to true to preserve the keys in the original array.<\/li>\n<\/ul>\n<div class=\"helpful-block-content\" data-title=\"\">\n\t<header>\n\t\t<div class=\"wth-question\">Did you find this tutorial useful?<\/div>\n\t\t<div class=\"wth-thumbs\">\n\t\t\t<button\n\t\t\t\tdata-post=\"1116\"\n\t\t\t\tdata-post-url=\"https:\/\/www.phptutorial.net\/php-tutorial\/php-array_reverse\/\"\n\t\t\t\tdata-post-title=\"PHP array_reverse\"\n\t\t\t\tdata-response=\"1\"\n\t\t\t\tclass=\"wth-btn-rounded wth-yes-btn\"\n\t\t\t>\n\t\t\t\t<svg\n\t\t\t\t\txmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n\t\t\t\t\tviewBox=\"0 0 24 24\"\n\t\t\t\t\tfill=\"none\"\n\t\t\t\t\tstroke=\"currentColor\"\n\t\t\t\t\tstroke-width=\"2\"\n\t\t\t\t\tstroke-linecap=\"round\"\n\t\t\t\t\tstroke-linejoin=\"round\"\n\t\t\t\t\tclass=\"feather feather-thumbs-up block w-full h-full\"\n\t\t\t\t>\n\t\t\t\t\t<path\n\t\t\t\t\t\td=\"M14 9V5a3 3 0 0 0-3-3l-4 9v11h11.28a2 2 0 0 0 2-1.7l1.38-9a2 2 0 0 0-2-2.3zM7 22H4a2 2 0 0 1-2-2v-7a2 2 0 0 1 2-2h3\"\n\t\t\t\t\t><\/path>\n\t\t\t\t<\/svg>\n\t\t\t\t<span class=\"sr-only\"> Yes <\/span>\n\t\t\t<\/button>\n\n\t\t\t<button\n\t\t\t\tdata-response=\"0\"\n\t\t\t\tdata-post=\"1116\"\n\t\t\t\tdata-post-url=\"https:\/\/www.phptutorial.net\/php-tutorial\/php-array_reverse\/\"\n\t\t\t\tdata-post-title=\"PHP array_reverse\"\n\t\t\t\tclass=\"wth-btn-rounded wth-no-btn\"\n\t\t\t>\n\t\t\t\t<svg\n\t\t\t\t\txmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n\t\t\t\t\tviewBox=\"0 0 24 24\"\n\t\t\t\t\tfill=\"none\"\n\t\t\t\t\tstroke=\"currentColor\"\n\t\t\t\t\tstroke-width=\"2\"\n\t\t\t\t\tstroke-linecap=\"round\"\n\t\t\t\t\tstroke-linejoin=\"round\"\n\t\t\t\t>\n\t\t\t\t\t<path\n\t\t\t\t\t\td=\"M10 15v4a3 3 0 0 0 3 3l4-9V2H5.72a2 2 0 0 0-2 1.7l-1.38 9a2 2 0 0 0 2 2.3zm7-13h2.67A2.31 2.31 0 0 1 22 4v7a2.31 2.31 0 0 1-2.33 2H17\"\n\t\t\t\t\t><\/path>\n\t\t\t\t<\/svg>\n\t\t\t\t<span class=\"sr-only\"> No <\/span>\n\t\t\t<\/button>\n\t\t<\/div>\n\t<\/header>\n\n\t<div class=\"wth-form hidden\">\n\t\t<div class=\"wth-form-wrapper\">\n\t\t\t<div class=\"wth-title\"><\/div>\n\t\t\t\n\t\t\t<textarea class=\"wth-message\"><\/textarea>\n\n\t\t\t<button class=\"btn btn-primary wth-btn-submit\">Send<\/button>\n\t\t\t<button class=\"btn wth-btn-cancel\">Cancel<\/button>\n\t\t\n\t\t<\/div>\n\t<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>In this tutorial, you will learn how to use the PHP array_reverse() function to reverse the order of elements in an array.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":15,"menu_order":52,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1116","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.phptutorial.net\/wp-json\/wp\/v2\/pages\/1116","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.phptutorial.net\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.phptutorial.net\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.phptutorial.net\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.phptutorial.net\/wp-json\/wp\/v2\/comments?post=1116"}],"version-history":[{"count":5,"href":"https:\/\/www.phptutorial.net\/wp-json\/wp\/v2\/pages\/1116\/revisions"}],"predecessor-version":[{"id":3075,"href":"https:\/\/www.phptutorial.net\/wp-json\/wp\/v2\/pages\/1116\/revisions\/3075"}],"up":[{"embeddable":true,"href":"https:\/\/www.phptutorial.net\/wp-json\/wp\/v2\/pages\/15"}],"wp:attachment":[{"href":"https:\/\/www.phptutorial.net\/wp-json\/wp\/v2\/media?parent=1116"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}