Analysis of some common operation code in PHP-PHP Tutorial-php.cn

Analysis of some common operation code in PHP

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Release： 2023-04-08 20:48:02

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Some common operation code examples in PHP 1

1. PHP can read random strings

This code will create a human-readable string that is closer to the word in the dictionary, practical, and has password verification capabilities.

2. PHP generates a random string

If you do not need a readable string, use this function instead to create a random string as the user's random password, etc.

/**@length - length of random string (must be a multiple of 2)**/
　　function readable_random_string($length = 6){
    　　$conso=array("b","c","d","f","g","h","j","k","l","m","n","p","r","s","t","v","w","x","y","z");
    　　$vocal=array("a","e","i","o","u");
    　　$password="";
    　　srand ((double)microtime()*1000000);
    　　$max = $length/2;
    　　for($i=1;$i<=$max; $i++){
        　　$password.=$conso[rand(0,19)];
        　　$password.=$vocal[rand(0,4)];
    　　}
    　　return $password;
　　}

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3. PHP Encoded Email Address

Using this code, any email address can be encoded as an html character entity to prevent it from being collected by spam programs.

/************* *@l - length of random string */ 
function generate_rand($l){ 
    $c= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; 
    srand((double)microtime()*1000000); 
    for($i=0; $i<$l; $i++) { 
        $rand.= 
    $c[rand()%strlen($c)]; 
    }
    return $rand; 
}

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4. PHP verification email address

Email verification is perhaps the most commonly used web form verification. In addition to verifying the email address, this code can also choose to check the DNS of the email domain. MX records make email verification more powerful.

function encode_email($email=&#39;info@domain.com&#39;, $linkText=&#39;Contact Us&#39;,$attrs =&#39;class="emailencoder"&#39; ) { 
    // remplazar aroba y puntos $email = 
str_replace(&#39;@&#39;, &#39;@&#39;, $email); 
    $email = str_replace(&#39;.&#39;, &#39;.&#39;, $email); 
    $email = 
str_split($email, 5); 
    $linkText = str_replace(&#39;@&#39;, &#39;@&#39;, $linkText); 
    $linkText = 
str_replace(&#39;.&#39;, &#39;.&#39;, $linkText); 
    $linkText = str_split($linkText, 5); 
    $part1 = &#39;part2 = &#39;ilto:&#39;; 
    $part3 = &#39;" &#39;. $attrs .&#39; >&#39;; 
    $part4 = &#39;&#39;; $encoded = &#39;&#39;; 
$encoded .= "document.write(&#39;$part1&#39;);"; 
    $encoded .= "document.write(&#39;$part2&#39;);"; 
    foreach($email as $e) { 
        $encoded .= "document.write(&#39;$e&#39;);"; 
    } 
    $encoded .= "document.write(&#39;$part3&#39;);"; 
foreach($linkText as $l) { 
        $encoded .= "document.write(&#39;$l&#39;);"; 
    } 
    $encoded .= "document.write(&#39;$part4&#39;);"; 
    $encoded .= &#39;&#39;; 
    return $encoded;
}

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5. PHP lists directory contents

function is_valid_email($email, $test_mx = false) { 
if(eregi("^([_a-z0-9-]+)(\.[_a-z0-9-]+)*@([a-z0-9-]+)(\.[a-z0-9-]+)*(\.[a-z]{2,4})$", $email)) 
    if($test_mx) { 
        list($username, $domain) = split("@", $email); 
        return getmxrr($domain, $mxrecords); 
    } else {
        return true; 
    }
     
}  else ｛
    return false; 
｝

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6. PHP destroys directory

Deletes a directory, including its contents.

function list_files($dir){ 
    if(is_dir($dir)) { 
        if($handle = opendir($dir)) { 
            while(($file = readdir($handle)) !== false) { 
                if($file != "." && $file != ".." && $file != "Thumbs.db") { 
                    echo &#39;&#39;.$file.&#39;a>　　&#39;."\n"; 
                 } 
            } closedir($handle); 
        } 
   } 
}

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7. PHP parses JSON data

Like most popular web services such as twitter that provide data through open APIs, it always knows how to parse the various transmission formats of API data. , including JSON, XML, etc.

/***** *@dir - Directory to destroy *@virtual[optional]- whether a virtual directory */ 
function destroyDir($dir, $virtual = false) { 
    $ds = DIRECTORY_SEPARATOR; 
    $dir = $virtual ? realpath($dir) : $dir; 
    $dir = substr($dir, -1) == $ds ? substr($dir, 0, -1) : $dir; 
    if (is_dir($dir) && $handle = opendir($dir)) { 
        while ($file = readdir($handle)) { 
            if ($file == &#39;.&#39; || $file == &#39;..&#39;) { 
                continue; 
            } elseif (is_dir($dir.$ds.$file)) { 
                destroyDir($dir.$ds.$file); 
            } else { 
                unlink($dir.$ds.$file); 
            } 
        } 
        closedir($handle); 
        rmdir($dir); 
        return true; 
    } else { 
        return false; 
    } 
}

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8. PHP parses XML data

$json_string=&#39;{"id":1,"name":"foo","email":"foo@foobar.com","interest":["wordpress","php"]} &#39;; 
$obj=json_decode($json_string); 
echo $obj->name; //prints foo echo 
$obj->interest[1]; //prints php

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9. PHP creates log abbreviation

Create user-friendly log abbreviation.

//xml string $xml_string="xml version=&#39;1.0&#39;?> Fooname> foo@bar.comname> user> Foobarname> foobar@foo.comname> user>users>"; 
 
//load the xml string using simplexml 
$xml = simplexml_load_string($xml_string); 
 
//loop through the each node of user 
foreach ($xml->user as $user) { 
    //access attribute 
    echo $user[&#39;id&#39;], &#39; &#39;; 
     
    //subnodes are accessed by -> operator 
    echo $user->name, &#39; &#39;; 
    echo $user->email,&#39;&#39;; 
}

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