{"id":66,"date":"2021-03-08T00:09:39","date_gmt":"2021-03-08T00:09:39","guid":{"rendered":"https:\/\/phptutorial.net\/?page_id=66"},"modified":"2025-04-06T01:52:02","modified_gmt":"2025-04-06T01:52:02","slug":"php-do-while","status":"publish","type":"page","link":"https:\/\/www.phptutorial.net\/php-tutorial\/php-do-while\/","title":{"rendered":"PHP do&#8230;while"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the PHP <code>do...while<\/code> loop statement to execute a code block repeatedly.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='introduction-to-php-do-while-loop-statement'>Introduction to PHP do&#8230;while loop statement <a href=\"#introduction-to-php-do-while-loop-statement\" class=\"anchor\" id=\"introduction-to-php-do-while-loop-statement\" title=\"Anchor for Introduction to PHP do...while loop statement\">#<\/a><\/h2>\n\n\n\n<p>The PHP <code>do...while<\/code>&nbsp;statement allows you to execute a code block repeatedly based on a Boolean expression. Here&#8217;s the syntax of the PHP <code>do-while<\/code> statement:<\/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\"><span class=\"hljs-meta\">&lt;?php<\/span>\n\n<span class=\"hljs-keyword\">do<\/span> {\n\tstatement;\n} <span class=\"hljs-keyword\">while<\/span> (expression);<\/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>Unlike the <code><a href=\"https:\/\/phptutorial.net\/php-tutorial\/php-do-while\/\">while<\/a><\/code> statement, PHP evaluates the <code>expression<\/code> at the end of each iteration. It means that the loop always executes at least once, even the <code>expression<\/code> is <code>false<\/code> before the loop enters.<\/p>\n\n\n\n<p>The following flowchart illustrates how the <code>do...while<\/code> statement works:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"167\" height=\"380\" src=\"https:\/\/phptutorial.net\/wp-content\/uploads\/2021\/03\/php-do-while.png\" alt=\"\" class=\"wp-image-411\" srcset=\"https:\/\/www.phptutorial.net\/wp-content\/uploads\/2021\/03\/php-do-while.png 167w, https:\/\/www.phptutorial.net\/wp-content\/uploads\/2021\/03\/php-do-while-132x300.png 132w\" sizes=\"auto, (max-width: 167px) 100vw, 167px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\" id='do-while-vs-while'>do&#8230;while vs. while <a href=\"#do-while-vs-while\" class=\"anchor\" id=\"do-while-vs-while\" title=\"Anchor for do...while vs. while\">#<\/a><\/h2>\n\n\n\n<p>The differences between the <code>do...while<\/code>&nbsp;and <code>while<\/code> statements are:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PHP executes the statement in <code>do...while<\/code> at least once,\u00a0whereas\u00a0it won&#8217;t execute the <code>statement<\/code> in the <code>while<\/code> statement if the <code>expression<\/code> is <code>false<\/code>.<\/li>\n\n\n\n<li>PHP evaluates the <code>expression<\/code> in the <code>do...while<\/code>\u00a0statement at the end of each iteration. Conversely, PHP evaluates the <code>expression<\/code> in the <code>while<\/code> statement at the beginning of each iteration.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id='php-do-while-loop-statement-example'>PHP do&#8230;while loop statement example <a href=\"#php-do-while-loop-statement-example\" class=\"anchor\" id=\"php-do-while-loop-statement-example\" title=\"Anchor for PHP do...while loop statement example\">#<\/a><\/h2>\n\n\n\n<p>In the following example, the code block inside the <code>do...while<\/code> loop statement executes precisely once.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-meta\">&lt;?php<\/span>\n\n$i = <span class=\"hljs-number\">0<\/span>;\n<span class=\"hljs-keyword\">do<\/span> {\n <span class=\"hljs-keyword\">echo<\/span> $i;\n} <span class=\"hljs-keyword\">while<\/span> ($i &gt; <span class=\"hljs-number\">0<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><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><a href=\"https:\/\/phptutorial.net\/playground\/?q=PD9waHAKCiRpID0gMDsKZG8gewogZWNobyAkaTsKfSB3aGlsZSAoJGkgPiAwKTs\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>The code inside the loop body executes first to display the variable <code>$i<\/code>. Because the value of the <code>$i<\/code> is 0, the condition is met, and the loop stops.<\/p>\n\n\n\n<p>In the following example, the code block inside the <code>do...while<\/code>&nbsp;loop executes ten times:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-meta\">&lt;?php<\/span>\n\n$i = <span class=\"hljs-number\">10<\/span>;\n\n<span class=\"hljs-keyword\">do<\/span> {\n    <span class=\"hljs-keyword\">echo<\/span> $i  . <span class=\"hljs-string\">'&lt;br&gt;'<\/span>;\n    $i--;\n} <span class=\"hljs-keyword\">while<\/span> ($i &gt; <span class=\"hljs-number\">0<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><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><a href=\"https:\/\/phptutorial.net\/playground\/?q=PD9waHAKCiRpID0gMTA7CgpkbyB7CiAgICBlY2hvICRpICAuICc8YnI-JzsKICAgICRpLS07Cn0gd2hpbGUgKCRpID4gMCk7\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>In this tutorial, you have learned how to use a PHP <code>do...while<\/code>&nbsp;loop statement to execute a code block repeatedly until a condition is <code>false<\/code>.<\/p>\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=\"66\"\n\t\t\t\tdata-post-url=\"https:\/\/www.phptutorial.net\/php-tutorial\/php-do-while\/\"\n\t\t\t\tdata-post-title=\"PHP do&#8230;while\"\n\t\t\t\tdata-response=\"1\"\n\t\t\t\tclass=\"wth-btn-rounded 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