引言PHP作为一种流行的服务器端脚本语言,在Web开发领域有着广泛的应用。为了帮助读者深入理解和掌握PHP的核心技术,本文将通过100个经典Web开发案例解析,帮助读者破解实战难题,提升Web开发能力...
PHP作为一种流行的服务器端脚本语言,在Web开发领域有着广泛的应用。为了帮助读者深入理解和掌握PHP的核心技术,本文将通过100个经典Web开发案例解析,帮助读者破解实战难题,提升Web开发能力。
<?php
// 变量声明
$age = 25;
$name = "John Doe";
// 数据类型
$floatVar = 23.5;
$arrayVar = array("value1", "value2", "value3");
?><?php
// if语句
if ($age > 18) { echo "You are an adult.";
}
// 循环
for ($i = 0; $i < 5; $i++) { echo "Loop iteration: " . $i . "n";
}
?><?php
$firstString = "Hello, ";
$secondString = "World!";
$result = $firstString . $secondString;
echo $result;
?><?php
$targetString = "This is a test string.";
$position = strpos($targetString, "test");
echo "The position of 'test' is: " . $position;
?><?php
$colors = array("red", "green", "blue");
foreach ($colors as $color) { echo $color . "n";
}
?><?php
$numbers = array(3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5);
sort($numbers);
foreach ($numbers as $number) { echo $number . "n";
}
?><?php
$fileHandle = fopen("example.txt", "r");
$line = fgets($fileHandle);
echo $line;
fclose($fileHandle);
?><?php
$fileHandle = fopen("example.txt", "w");
fwrite($fileHandle, "Hello, World!");
fclose($fileHandle);
?><?php
$mysqli = new mysqli("localhost", "username", "password", "database");
?><?php
$query = "SELECT * FROM users";
$result = $mysqli->query($query);
?><?php
session_start();
?><?php
$_SESSION['username'] = "John Doe";
?>通过以上100个经典Web开发案例解析,读者可以深入了解PHP的核心技术,并学会在实际项目中应用这些技术。在后续的案例中,我们将继续深入探讨PHP的高级特性,如面向对象编程、错误处理、安全性和性能优化等。