file:str-lengh.php
url:http://localhost:88/str/str-lengh.php
<?php
    $word = 'Hello, Ryan!';
    echo "String($word)'s length: ".strlen($word)."<br/>";
    
    // for循环访问数组
    //for($i=0; $i<strlen($word); $i++){
    //    echo $word[$i],"<br/>";
    //}
    
    // while循环访问数组
    $i=0;
    while($i<strlen($word)){
         echo $word[$i],"<br/>";
         $i++
    }
?>

file:str-strip-tags.php
url:http://localhost:88/str/str-strip-tags.php
<?php
    // 字符串中的所有html标签都闭合
    $text = "<h1>hello world!</h1><h1>hello world!</h1><h1>hello world!</h1>";
    
    // 输出原始的字符串内容
    echo "Original Text:";
    echo $text."<br/>";
    
    // 去除所有html标签后进行输出
    echo "Destination Text(After strip_tags)"."<br/>";
    echo strip_tags($text)."<br/>";

    // 字符串中的html标签不闭合
    $text = "<h1>hello world!";
    
    // 去除所有html标签后进行输出
    echo "Original Text:";
    echo $text."<br/>";
    
    // 去除所有html标签后进行输出
    echo "Destination Text(After strip_tags)"."<br/>";
    echo strip_tags($text)."<br/>";
?>

file:str-entities.php
url:http://localhost:88/str/str-entities.php
<?php
    $text = "hello & world!";
    
    echo $text."<br/>";
    
    echo rawurlencode($text)."<br/>";
?>

file:str-wordwrap.php
url:http://localhost:88/str/str-wordwrap.php
<?php
    $text = "This document covers the JavaTM 2 Platform Standard Edition 5.0 Development Kit (JDK 5.0). Its external version number is 5.0 and internal version number is 1.5.0. For information on a feature of the JDK, click on its component in the diagram below.";
    
    echo "Original text:"."<br/>";
    echo $text."<br/>";
    
    echo $text."<hr/>";
    
    echo "Destination text(after wrap):"."<br/>";
    echo wordwrap($text, 50, "<br/>")."<br/>";
?>

file:str-strpos.php
url:http://localhost:88/str/str-strpos.php
<?php
    $text = "hello world!";
    
    echo strpos($text, "e");  
?>

file:str-strreplace.php
url:http://localhost:88/str/str-strreplace.php
<?php
    $text = "This document covers the JavaTM 2 Platform Standard Edition 5.0 Development Kit (JDK 5.0). Its external version number is 5.0 and internal version number is 1.5.0. For information on a feature of the JDK, click on its component in the diagram below.";
   
    echo "Original text:"."<br/>";
    echo $text."<br/>";
    
    echo "<hr/>";
    
    echo "Destination text(replace):"."<br/>";
    echo str_replace(" ", "__", $text)."<br/>";    
?>

file:str-compare.php
url:http://localhost:88/file/str-compare.php
<?php
    $main_str = 'hello world';
    $str = 'hello world, Ryan!';
    echo substr_compare($main_str, $str, 0);
?>

file:str-sub.php
url:http://localhost:88/file/str-sub.php
<?php
    $str = 'hello world,today is sunday!';
    $start = strpos($str, ',');
    $newStr = substr($str, $start+1);

    echo 'Original String: '.$str.'<br/>';
    echo 'Destination String: '.$newStr.'<br/>';
?>

file:str-count.php
url:http://localhost:88/file/str-count.php
<?php
    $str = 'abcdefgacef';
    
    echo substr_count($str, 'a');
?>

file:str-explode-implode.php
url:http://localhost:88/str/str-explode-implode.php
<?php
    $text = "This document covers the JavaTM 2 Platform Standard Edition 5.0 Development Kit (JDK 5.0). Its external version number is 5.0 and internal version number is 1.5.0. For information on a feature of the JDK, click on its component in the diagram below.";
   
    echo "Original text:"."<br/>";
    echo $text."<br/>";
    
    echo "<hr/>";
    
    $sentenses = explode(". ", $text);
    echo "Destination text(explode):"."<br/>";
    foreach ($sentenses as $sentense){
        echo $sentense."<br/>";
    }
    
    echo "<hr/>";
    
    $newText= implode($sentenses, ". ");
    
    echo "Destination text(implode):"."<br/>";
    echo $newText."<br/>";    
?>

file:str-trim.php
url:http://localhost:88/str/str-trim.php
<?php
    $text = "   hello world!  ";
    
    echo "Original text:"."<br/>";
    echo strlen($text)."<br/>";
    
    echo "<hr/>";
    
    echo "Destination text(trim):"."<br/>";
    echo strlen(trim($text))."<br/>"; 
?>

file:str-printf.php
url:http://localhost:88/str/str-printf.php
<?php
    $format = 'hello, %2$s, userNo: %1$s';
    $who = 'Ryan';
    $no = '10';
    
    echo printf($format, $no, $who);    
?>