In-depth instructions for using PHP data caching_PHP tutorial
// http://www.jb51.net/article/23093.htm
function set_cache($name, $value) {
// 设置相对或者绝对目录,末尾不要加 "/"
$cache_dir = "./cache";
// 设置扩展名
$cache_extension = ".php";
$cache_str_begin = " if (! is_array ( $value )) {
$cache_str_middle = "\$$name = \"$value\";";
} else {
$cache_str_middle = "\$$name = " . arrayeval ( $value ) . ";";
}
$cache_str_end = "\n?>";
$cache_str = $cache_str_begin . $cache_str_middle . $cache_str_end;
// 缓存文件路径
$cache_file = "$cache_dir/$name$cache_extension";
if ($fp = @fopen ( $cache_file, "wb" )) {
fwrite ( $fp, $cache_str );
fclose ( $fp );
return true;
} else {
echo $cache_file;
exit ( "Can not write to cache files, please check cache directory " );
return false;
}
}
// 将array变成字符串, 来自discuz!
function arrayeval($array, $level = 0) {
if (! is_array ( $array )) {
return "\"$array\"";
}
$space = "";
for($i = 0; $i $space .= "\t";
}
$evaluate = "Array\n$space(\n";
$comma = $space;
if (is_array ( $array )) {
foreach ( $array as $key => $val ) {
$key = is_string ( $key ) ? "\"" . addcslashes ( $key, "\"\\" ) . "\"" : $key;
$val = ! is_array ( $val ) && (! preg_match ( "/^\-?[1-9]\d*$/", $val ) || strlen ( $val ) > 12) ? "\"" . addcslashes ( $val, "\"\\" ) . "\"" : $val;
if (is_array ( $val )) {
$evaluate .= "$comma$key => " . arrayeval ( $val, $level + 1 );
} else {
$evaluate .= "$comma$key => $val";
}
$comma = ",\n$space";
}
}
$evaluate .= "\n$space)";
return $evaluate;
}
$test_array = array (
"6b" => "a\\",
"b",
"c",
array (
"c",
"d"
)
);
$fileAndVarName = "newFile";
// 在生成$encode_str的时候,为使字符串中原有字符格式不变,系统在编译时会给字符串中预定义字符前加 \ 使预定义字符保留在字符串中,但输出或打印字符串的时候只会输出打印出预定义字符,不会打印出预定义字符前面的 \
$encode_str = json_encode ( $test_array );
// 因为这里要把字符串打印成PHP代码,输出的时候,字符串中预定义字符会打乱程序运行,所以要在原有转义字符前再加转移字符,使字符串输出打印时在预定义字符前转义字符也能输出
$addslashes_str = addslashes ( $encode_str ); // addslashes将字符串中预定义字符前加 \ 使其能存放在字符串中不产生作用,不参与程序运行
echo stripslashes($addslashes_str); // 反转义函数,可去掉字符串中的反斜线字符。若是连续二个反斜线,则去掉一个,留下一个。若只有一个反斜线,就直接去掉。
echo "
";
// You can pass an array object or a string converted into json, which needs to be converted into an array when used.
set_cache ( "$fileAndVarName", $addslashes_str );
var_dump ( $addslashes_str );
echo "
";
include_once "./cache/$fileAndVarName.php";
var_dump ( $$fileAndVarName );
echo "
";
$decode_arr = ( array ) json_decode ( $$fileAndVarName );
var_dump ( $decode_arr );
echo "
";
// Another method of caching, use serialize to convert the array serial number into a string, store it in a file with any extension, use fopen to open it to read the string content, and then use unserialize to deserialize it into the original data
$serialize_str = serialize ( $test_array );
echo $serialize_str; // This is the array described but here it is just a string
echo "
";
$unserialize_str = unserialize ( $serialize_str ); // Restore the described data
var_dump($unserialize_str); // Restore to $test_array, the array structure is not lost.
?>

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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