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[PHP] ¹è¿­ Array
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Create an Array in PHP
º¯¼ö¸¦ ¸¸µé ¶§´Â array()¶ó´Â ÇÔ¼ö¸¦ »ç¿ëÇÕ´Ï´Ù.

PHP¿¡¼­´Â 3°¡Áö ÇüÅÂÀÇ ¹è¿­À» Á¦°øÇÕ´Ï´Ù. C¾ð¾î¿¡¼­´Â ¼ýÀڷθ¸ Á¢±ÙÀÌ °¡´ÉÇߴµ¥ STL¿¡ ³ª¿À´Â ÀڷᱸÁ¶Ã³·³ PHP¿¡¼­´Â ¹®ÀÚ¿­À» Å°(key)·Î »ç¿ëÇÒ ¼ö ÀÖ½À´Ï´Ù. ¹®ÀÚ¿­ Å°°¡ °¡´ÉÇÑ ¹è¿­ÀÌ Associative arraysÀÔ´Ï´Ù. Multidimensional arrays´Â ¹è¿­¿¡ ¹è¿­ÀÌ µé¾î°¡´Â ±¸Á¶ÀÔ´Ï´Ù. C¾ð¾î¿¡¼­ ´ÙÂ÷¿ø(2Â÷¿ø, 3Â÷¿ø, ...) ¹è¿­Ã³·³ PHP¿¡¼­ ´ÙÂ÷¿ø ¹è¿­ÀÌ °¡´ÉÇÕ´Ï´Ù. ´ÙÂ÷¿ø ¹è¿­Àº À̹ø ½Ã°£ÀÌ ´Ù·çÁö ¾Ê½À´Ï´Ù.

PHP ¹è¿­ Á¾·ù
Indexed arrays – ¼ýÀÚ°¡ Å° °ªÀÌ µÇ´Â ÀϹÝÀûÀÎ ÇüÅÂÀÇ ¹è¿­
Associative arrays – ¹®ÀÚ¿­ÀÌ Å° °ªÀÌ µÇ´Â ÇüÅÂÀÇ ¹è¿­
Multidimensional arrays – ´ÙÂ÷¿ø ¹è¿­

PHP Indexed Arrays
¼ýÀÚ°¡ Å°ÀÎ ¹è¿­Àº À妽º°¡ 0ºÎÅÍ ½ÃÀÛÇÕ´Ï´Ù.
´ÙÀ½°ú °°ÀÌ ÆíÇÏ°Ô arrayÇÔ¼ö¸¦ »ç¿ëÇØ ¹è¿­À» ¸¸µé ¼ö ÀÖ½À´Ï´Ù.


$cars = array("Volvo", "BMW", "Toyota");

arrayÇÔ¼ö ¸»°í Á÷Á¢ À妽º¿¡ ±× °ªÀ» ä¿ö ³Ö¾î ¹è¿­À» ¸¸µé ¼öµµ ÀÖ½À´Ï´Ù.

$cars[0] = "Volvo";
$cars[1] = "BMW";
$cars[2] = "Toyota";

´ÙÀ½Àº ¾Õ¿¡¼­ ³ª¿Â ¿¹Á¦Àä, ÀÌÁ¦ ÀÌÇØ°¡ µÇ½Ã³ª¿ä? ¹è¿­ ÇϳªÇϳª Á¢±ÙÀº $car[0]¿Í °°ÀÌ ¼ýÀÚ Å° °ªÀ» »ç¿ëÇÕ´Ï´Ù.

$cars = array("Volvo", "BMW", "Toyota");
echo "I like " . $cars[0] . ", " . $cars[1] . " and " . $cars[2] . ".";
Get The Length of an Array - The count() Function

¹è¿­¿¡ °³¼ö¸¦ ¾Ë°í ½Í´Ù¸é ¿ì¸®´Â count()ÇÔ¼ö¸¦ »ç¿ëÇÒ ¼ö ÀÖ½À´Ï´Ù.

$cars = array("Volvo", "BMW", "Toyota");
echo count($cars); // Ãâ·Â 3

µ¥ÀÌÅ͸¦ ÀüºÎ Ãâ·ÂÇÏ°í ½ÍÀºµ¥, µ¥ÀÌÅÍ°¡ ¸¹À» °æ¿ì¿¡ ¹è¿­ °³¼ö¸¦ Á÷Á¢ È®ÀÎÇÏ´Â °ÍÀº ¾î·Á¿îµ¥¿ä, count() ÇÔ¼ö¿Í for¹®À» »ç¿ëÇØ Ã³¸®ÇÒ ¼ö ÀÖ½À´Ï´Ù.

for($i = 0; $i < count($cars); $i++) {
    echo "$cars[$i] ";
}

PHP Associative Arrays
Ä¿¹Â´ÏƼ »çÀÌÆ®¿¡¼­ Å° °ª Áï ¼­·Î ±¸ºÐÇÒ ¼ö ÀÖ´Â °ÍÀº ¾ÆÀ̵𰡠µÉ °ÍÀÔ´Ï´Ù. ´ÙÀ½ ¿¹Á¦¿¡¼­´Â À̸§À» Å° °ªÀ¸·Î »ç¿ëÇØ ¹è¿­À» »ý¼ºÇÏ°í ÀÖ½À´Ï´Ù.

$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");


À§ Äڵ带 ¾Æ·¡Ã³·³ ¸¸µé ¼öµµ ÀÖ½À´Ï´Ù.

$age[¢¥Peter¢¥] = "35";
$age[¢¥Ben¢¥] = "37";
$age[¢¥Joe¢¥] = "43";

´ÙÀ½Ã³·³ ¹®ÀÚ¿­ Å°¸¦ »ç¿ëÇØ ¹è¿­¿¡ Á¢±ÙÇÒ ¼ö ÀÖ½À´Ï´Ù.

$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");
echo "Peter is " . $age[¢¥Peter¢¥] . " years old.";

¼ýÀÚ°¡ Å°ÀÎ ¹è¿­¿¡¼­´Â ¼ýÀÚ¸¦ ÀÌ¿ëÇØ ¼Õ½±°Ô ¹Ýº¹¹® for¹®À» »ç¿ëÇÒ ¼ö ÀÖ¾ú´Âµ¥¿ä, ¹®ÀÚ¿­ÀÌ Å°ÀÎ ¹è¿­¿¡¼­´Â ¾î¶»°Ô ¹Ýº¹¹®À» »ç¿ëÇÒ ¼ö ÀÖÀ»±î¿ä?

¿ì¸®´Â foreach¶ó´Â ¹Ýº¹¹®À» ¹è¿ü´Âµ¥¿ä, ÀÌ ¹Ýº¹¹®À» »ç¿ëÇϸé À妽º(index) Áï ¼ýÀÚ Å°³ª ¹®ÀÚ¿­ Å° °ªÀÌ ¾øÀ̵µ ¹Ýº¹ÇÒ ¼ö ÀÖ½À´Ï´Ù.

$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");
foreach($age as $x => $x_value) {
    echo "Key=" . $x . ", Value=" . $x_value;
    echo "<br>";
}

À§ ¿¹Á¦¿¡¼­´Â ¡®$x => $x_value¡¯¸¦ ³Ö¾î $x¿¡ Å° °ª, $x_value¿¡ ¹è¿­ °ªÀÌ ·çÇÁ¸¦ µ¹ ¶§¸¶´Ù ÀúÀåµË´Ï´Ù. µû¶ó¼­ Ãâ·Â°ªÀº ´ÙÀ½°ú °°½À´Ï´Ù.

Key=Peter, Value=35
Key=Ben, Value=37
Key=Joe, Value=43

ÇÑ °¡Áö ´õ Ãß°¡Çϸé PHP ¹è¿­ ¾È¿¡´Â ¹®ÀÚ¿­, Á¤¼ö, ¼Ò¼ö µî ¼­·Î ´Ù¸¥ ÀÚ·áÇüÀ» ´Ù·ê ¼ö ÀÖ½À´Ï´Ù. ¿äÁò ³ª¿À´Â ¾ð¾îµéÀº ÀÚ·áÇü¿¡ °ü°è¾øÀÌ °°Àº ¹è¿­ ȤÀº ¸®½ºÆ® ¾È¿¡ ´Ù ´ã¾Æ µÑ ¼ö ÀÖ°í ¶Ç Ã³¸®ÇØÁÝ´Ï´Ù. ³Ê¹«³ª ´ç¿¬ÇÑ À̾߱âó·³ µé¸®Áö¸¸, ¿¾³¯ C¾ð¾î¸¸ ´Ù·ç´ø ½ÃÀý·Î µ¹¾Æ°¡¸é ÀÌ·± ÀڷᱸÁ¶´Â Çõ¸íÀûÀΠ󸮹æ½ÄÀÔ´Ï´Ù.

¾Æ·¡ ¿¹Á¦´Â ¹®ÀÚ¿­, Á¤¼ö, ½Ç¼ö¸¦ ¹è¿­·Î »ý¼ºÇÏ°í ÀÖ½À´Ï´Ù. ¾Æ·¡ Äڵ带 º¸½Ã¸é ¾Æ½Ã°ÚÁö¸¸, °è»ê °á°ú¸¦ º¸¸é ¹è¿­ ³»¿ëÀÌ ¸ðµÎ ¹®ÀÚ¿­·Î 󸮵Ǵ °ÍÀÌ ¾Æ´Ï¶ó Á¤¼ö´Â Á¤¼öÀÇ Æ¯¼ºÀ» °¡Áö°í ½Ç¼ö´Â ½Ç¼öÀÇ Æ¯¼ºÀ» °¡Áø´Ù´Â °ÍÀ» ¾Ë ¼ö ÀÖ½À´Ï´Ù.

$pi = array("PI", 3, .141592);
for($i = 0; $i < count($pi); $i++) {
    echo "$pi[$i] ";
}
echo "<br>";
echo ($pi[1]+$pi[2])."<br>";
echo ($pi[1]-$pi[2])."<br>";

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3.141592
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