吴裕雄--天生自然 PHP开发学习：字符串变量

<?php

$txt="Hello world!";

echo $txt;

?>

<?php

$txt1="Hello world!";

$txt2="What a nice day!";

echo $txt1 . " " . $txt2;

?>

<?php

echo strlen("Hello world!");

?>

<?php

echo strpos("Hello world!","world");

?>

<?php

$str = addcslashes("Hello World!","W");

echo($str);

?>

<?php

$str = "Welcome to my humble Homepage!";

echo $str."<br>";

echo addcslashes($str,'m')."<br>";

echo addcslashes($str,'H')."<br>";

?>

<?php

$str = "Welcome to my humble Homepage!";

echo $str."<br>";

echo addcslashes($str,'A..Z')."<br>";

echo addcslashes($str,'a..z')."<br>";

echo addcslashes($str,'a..g');

?>

<?php

$str = addslashes('What does "yolo" mean?');

echo($str);

?>

<?php

$str = "Who's Peter Griffin?";

echo $str . " This is not safe in a database query.<br>";

echo addslashes($str) . " This is safe in a database query.";

?>

<?php

$str = bin2hex("Hello World!");

echo($str);

?>

<?php

$str = "Hello world!";

echo bin2hex($str) . "<br>";

echo pack("H*",bin2hex($str)) . "<br>";

?>

<?php

$str = "Hello World!";

echo $str . "<br>";

echo chop($str,"World!");

?>

<?php

$str = "Hello World!\n\n";

echo $str;

echo chop($str);

?>

<!DOCTYPE html>

<html>

<body>

Hello World!

Hello World!

</body>

</html>

<?php

echo chr(52) . "<br>"; // Decimal value

echo chr(052) . "<br>"; // Octal value

echo chr(0x52) . "<br>"; // Hex value

?>

<?php

$str = chr(43);

$str2 = chr(61);

echo("2 $str 2 $str2 4");

?>

<?php

$str = "Hello world!";

echo chunk_split($str,1,".");

?>

<?php

$str = "Hello world!";

echo chunk_split($str,6,"...");

?>

<?php

$str = "Hello world! æøå";

echo $str . "<br>";

echo convert_cyr_string($str,'w','a');

?>

<?php

$str = ",2&5L;&@=V]R;&0A `";

echo convert_uudecode($str);

?>

<?php

$str = "Hello world!";

// Encode the string

$encodeString = convert_uuencode($str);

echo $encodeString . "<br>";

// Decode the string

$decodeString = convert_uudecode($encodeString);

echo $decodeString;

?>

<?php

$str = "Hello world!";

echo convert_uuencode($str);

?>

<?php

$str = "Hello world!";

// Encode the string

$encodeString = convert_uuencode($str);

echo $encodeString . "<br>";

// Decode the string

$decodeString = convert_uudecode($encodeString);

echo $decodeString;

?>

<?php

$str = "Hello World!";

echo count_chars($str,3);

?>

<?php

$str = "Hello World!";

echo count_chars($str,4);

?>

<?php

$str = "Hello World!";

print_r(count_chars($str,1));

?>

<?php

$str = "PHP is pretty fun!!";

$strArray = count_chars($str,1);

foreach ($strArray as $key=>$value)

{

    echo "The character <b>'".chr($key)."'</b> was found $value time(s)<br>";

}

?>

<?php

$str = crc32("Hello World!");

printf("%un",$str);

?>

<?php

$str = crc32("Hello world!");

echo 'Without %u: '.$str."<br>";

echo 'With %u: ';

printf("%u",$str);

?>

<?php

$str = crc32("Hello world.");

echo 'Without %u: '.$str."<br>";

echo 'With %u: ';

printf("%u",$str);

?>

<?php

$hashed_password = crypt('mypassword'); // 自动生成盐值

/* 你应当使用 crypt() 得到的完整结果作为盐值进行密码校验，以此来避免使用不同散列算法导致的问题。（如上所述，基于标准 DES 算法的密码散列使用 2 字符盐值，但是基于 MD5 算法的散列使用 12 个字符盐值。）*/

if (hash_equals($hashed_password, crypt($user_input, $hashed_password))) {

    echo "Password verified!";

}

?>

<?php

// 设置密码

$password = 'mypassword';

// 获取散列值，使用自动盐值

$hash = crypt($password);

?>

<?php

if (CRYPT_STD_DES == 1) {

    echo 'Standard DES: ' . crypt('rasmuslerdorf', 'rl') . "\n";

}

if (CRYPT_EXT_DES == 1) {

    echo 'Extended DES: ' . crypt('rasmuslerdorf', '_J9..rasm') . "\n";

}

if (CRYPT_MD5 == 1) {

    echo 'MD5:          ' . crypt('rasmuslerdorf', '$1$rasmusle$') . "\n";

}

if (CRYPT_BLOWFISH == 1) {

    echo 'Blowfish:     ' . crypt('rasmuslerdorf', '$2a$07$usesomesillystringforsalt$') . "\n";

}

if (CRYPT_SHA256 == 1) {

    echo 'SHA-256:      ' . crypt('rasmuslerdorf', '$5$rounds=5000$usesomesillystringforsalt$') . "\n";

}

if (CRYPT_SHA512 == 1) {

    echo 'SHA-512:      ' . crypt('rasmuslerdorf', '$6$rounds=5000$usesomesillystringforsalt$') . "\n";

}

?>

<?php

echo "Hello world!";

?>

<?php

$str = "Hello world!";

echo $str;

?>

<?php

$str = "Hello world!";

echo $str;

echo "<br>What a nice day!";

?>

<?php

$str1="Hello world!";

$str2="What a nice day!";

echo $str1 . " " . $str2;

?>

<?php

$age=array("Peter"=>"35");

echo "Peter is " . $age['Peter'] . " years old.";

?>

<?php

echo "This text

spans multiple

lines.";

?>

<?php

echo 'This ','string ','was ','made ','with multiple parameters.';

?>

<?php

$color = "red";

echo "Roses are $color";

echo "<br>";

echo 'Roses are $color';

?>

<?php

$color = "red";

?>

<p>Roses are <?=$color?></p>

<?php

$str = "www.runoob.com";

print_r (explode(".",$str));

?>

<?php

$str = 'one,two,three,four';

//  返回包含一个元素的数组

print_r(explode(',',$str,0));

print "<br>";

// 数组元素为 2

print_r(explode(',',$str,2));

print "<br>";

// 删除最后一个数组元素

print_r(explode(',',$str,-1));

?>

<?php

$number = 9;

$str = "Beijing";

$file = fopen("E:\\test.txt","w");

echo fprintf($file,"There are %u million bicycles in %s.",$number,$str);

?>

<?php

$number = 123;

$file = fopen("test.txt","w");

fprintf($file,"%f",$number);

?>

<?php

$number = 123;

$file = fopen("E:\\test.txt","w");

fprintf($file,"With 2 decimals: %1$.2f

nWith no decimals: %1$u",$number);

?>

<?php

$num1 = 123456789;

$num2 = -123456789;

$char = 50; // The ASCII Character 50 is 2

// Note: The format value "%%" returns a percent sign

printf("%%b = %b <br>",$num1); // Binary number

printf("%%c = %c <br>",$char); // The ASCII Character

printf("%%d = %d <br>",$num1); // Signed decimal number

printf("%%d = %d <br>",$num2); // Signed decimal number

printf("%%e = %e <br>",$num1); // Scientific notation (lowercase)

printf("%%E = %E <br>",$num1); // Scientific notation (uppercase)

printf("%%u = %u <br>",$num1); // Unsigned decimal number (positive)

printf("%%u = %u <br>",$num2); // Unsigned decimal number (negative)

printf("%%f = %f <br>",$num1); // Floating-point number (local settings aware)

printf("%%F = %F <br>",$num1); // Floating-point number (not local settings aware)

printf("%%g = %g <br>",$num1); // Shorter of %e and %f

printf("%%G = %G <br>",$num1); // Shorter of %E and %f

printf("%%o = %o <br>",$num1); // Octal number

printf("%%s = %s <br>",$num1); // String

printf("%%x = %x <br>",$num1); // Hexadecimal number (lowercase)

printf("%%X = %X <br>",$num1); // Hexadecimal number (uppercase)

printf("%%+d = %+d <br>",$num1); // Sign specifier (positive)

printf("%%+d = %+d <br>",$num2); // Sign specifier (negative)

?>

<?php

print_r (get_html_translation_table()); // HTML_SPECIALCHARS is default.

?>

<?php

print_r (get_html_translation_table(HTML_SPECIALCHARS));

?>

<?php

print_r (get_html_translation_table(HTML_ENTITIES));

?>

<?php

echo hebrev("á çùåï äúùñâ");

?>

<?php

echo hebrevc("á çùåï äúùñâ\ná çùåï äúùñâ");

?>

<?php

echo hex2bin("48656c6c6f20576f726c6421");

?>

<?php

$str = "&lt;&copy; W3CS&ccedil;h&deg;&deg;&brvbar;&sect;&gt;";

echo html_entity_decode($str);

?>

<?php

$str = "Jane &amp; 'Tarzan'";

echo html_entity_decode($str, ENT_COMPAT); // Will only convert double quotes

echo "<br>";

echo html_entity_decode($str, ENT_QUOTES); // Converts double and single quotes

echo "<br>";

echo html_entity_decode($str, ENT_NOQUOTES); // Does not convert any quotes

?>

<?php

$str = "My name is &Oslash;yvind &Aring;sane. I'm Norwegian.";

echo html_entity_decode($str, ENT_QUOTES, "ISO-8859-1");

?>

<?php

$str = "This is some <b>bold</b> text.";

echo htmlspecialchars($str);

?>

<?php

$str = "Jane & 'Tarzan'";

echo htmlspecialchars($str, ENT_COMPAT); // 默认，仅编码双引号

echo "<br>";

echo htmlspecialchars($str, ENT_QUOTES); // 编码双引号和单引号

echo "<br>";

echo htmlspecialchars($str, ENT_NOQUOTES); // 不编码任何引号

?>

<?php

$str = 'I love "PHP".';

echo htmlspecialchars($str, ENT_QUOTES); // 编码双引号和单引号

?>

;

<?php

$arr = array('Hello','World!','Beautiful','Day!');

echo implode(" ",$arr);

?>

<?php

$arr = array('Hello','World!','Beautiful','Day!');

echo implode(" ",$arr)."<br>";

echo implode("+",$arr)."<br>";

echo implode("-",$arr)."<br>";

echo implode("X",$arr);

?>

<?php

$arr = array('Hello','World!','Beautiful','Day!');

echo join(" ",$arr);

?>

<?php

$arr = array('Hello','World!','Beautiful','Day!');

echo join(" ",$arr)."<br>";

echo join("+",$arr)."<br>";

echo join("-",$arr)."<br>";

echo join("X",$arr);

?>

<?php

echo lcfirst("Hello world!");

?>

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