PHP If...Else...Elseif

Last modified on: October 19, 2024

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<h3>PHP If...Else...Elseif</h3>
<p>The <code>if</code>, <code>else</code>, and <code>elseif</code> statements in PHP are used for conditional execution of code. They allow you to execute different blocks of code based on certain conditions.</p>
<h4>Basic Structure</h4>
<p>The basic syntax of these conditional statements is as follows:</p>
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<pre class="language-php"><code>if (condition) {
    // Code to execute if the condition is true
} elseif (another_condition) {
    // Code to execute if the previous condition is false and this condition is true
} else {
    // Code to execute if all conditions are false
}</code></pre>
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<h3>Examples</h3>
<h4>1. Simple If Statement</h4>
<p>The simplest form of the conditional statement.</p>
<p><strong>Example:</strong></p>
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<pre class="language-php"><code>$age = 20;

if ($age &gt;= 18) {
    echo "You are an adult.";
}</code></pre>
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<p><em>Output:</em> <code>You are an adult.</code></p>
<h4>2. If...Else Statement</h4>
<p>Used to specify an alternative action if the condition is false.</p>
<p><strong>Example:</strong></p>
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<pre class="language-php"><code>$age = 16;

if ($age &gt;= 18) {
    echo "You are an adult.";
} else {
    echo "You are not an adult.";
}</code></pre>
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<p><em>Output:</em> <code>You are not an adult.</code></p>
<h4>3. If...Elseif...Else Statement</h4>
<p>Used to check multiple conditions.</p>
<p><strong>Example:</strong></p>
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<pre class="language-php"><code>$score = 85;

if ($score &gt;= 90) {
    echo "Grade: A";
} elseif ($score &gt;= 80) {
    echo "Grade: B";
} elseif ($score &gt;= 70) {
    echo "Grade: C";
} else {
    echo "Grade: D";
}</code></pre>
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<p><em>Output:</em> <code>Grade: B</code></p>
<h3>Multiple Conditions</h3>
<p>You can combine multiple conditions using logical operators like <code>&amp;&amp;</code> (AND) and <code>||</code> (OR).</p>
<p><strong>Example:</strong></p>
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<pre class="language-php"><code>$age = 20;
$hasPermission = true;

if ($age &gt;= 18 &amp;&amp; $hasPermission) {
    echo "You can enter.";
} else {
    echo "Access denied.";
}</code></pre>
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<p><em>Output:</em> <code>You can enter.</code></p>
<h3>Ternary Operator as a Shortcut</h3>
<p>For simple conditions, you can use the ternary operator as a shorthand.</p>
<p><strong>Example:</strong></p>
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<pre class="language-php"><code>$age = 17;
$result = ($age &gt;= 18) ? "Adult" : "Not an adult";
echo $result; // Output: Not an adult</code></pre>
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<h3>&nbsp;</h3>
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