PHP: Built-In Functions
Example: strtoupper function
<?php
$name="William Smith";
echo "<p>My name is $name.</p>";
echo "<p>My name is " . strtoupper($name) . ".</p>";
?>
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Example: number_format function
<?php
$salary = 35000;
$name = "Paul Smith";
echo "<p>$name's salary is $salary</p>";
echo "<p>$name's salary is $" . number_format($salary, 2, '.', ',') . "</p>";
?>
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Example: strlen and substr_count functions
<?php
$name = "John Michael Smith";
$count1 = strlen($name);
$num_spaces1 = substr_count($name," ");
$count2 = $count1 - $num_spaces1;
echo "<p>$name</p>";
echo "<p>John, your full name has $count1 characters in it when you include spaces.</p>";
echo "<p>John, your full name has $count2 characters in it when you do not include
spaces.</p>";
$name = str_replace("Michael","Robert",$name);
echo "<p>Your full name is now $name.</p>";
?>
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Example: date function
<?php
$date1 = date("m/d/y");
echo "<p>The date today is $date1.</p>";
echo "<p>Tomorrow is " . date('l', time()+86400) . ".</p>";
?>
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Example: Simple PHP Output with Hyperlink
<?php
$x=10.2;
echo "<p>". ceil($x) ."</p>";
echo "<p>". floor($x) ."</p>";
echo "<p>". round($x) ."</p>";
echo "<p>". pow($x,2) ."</p>";
echo "<p>". sqrt($x) ."</p>";
echo "<p>". rand(1,100) ."</p>";
?>
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