PHP regular && Array

<?php
Regular expressions
Slash stands for delimiter/^$/
$str = "abcde123fg456h";
$reg = "/\d/";
Preg_replace ($reg, "#", $str);//replace string str with regular expression reg
Var_dump (Preg_replace ($reg, "#", $str));

$str = "a1cd3fg6h";
$reg = "/\d/";
Var_dump (Preg_split ($reg, $STR))//split string according to regular expression

$str = "a1b2cd3e";
$reg = "/\d/";
$arr =array ();
Preg_match ($reg, $str, $arr);//Match the first data in a string that satisfies a regular expression

Var_dump ($arr);
Preg_match_all ($reg, $str, $arr);//Match all data in a string that satisfies a regular expression
Var_dump ($arr);

Array
$arr =array (1,2,3,4,5);//1. Define array mode
Var_dump ($arr);

2. Assignment definitions
$arr 1[0]=5;
$arr 1[1]=6;
$arr 1[2]=10;
Var_dump ($arr 1);

Array classification
1. Indexed arrays
$arr =array (1,2,3,4,5);
Echo $arr [2];

2. Associative arrays
$arr =array ("One" =>5, "one" =>10);
Echo $arr ["both"];
Var_dump ($arr ["the"]);

PHP Array Features: Can store any type of data, array length can be changed

Iterating through an array
$arr =array ("AA", "BB", 5, "CC", 10);

1.for loop traversal, cannot traverse associative array, traverse indexed array
for ($i =0; $i <count ($arr); $i + +)
{
echo $arr [$i]. " <br/> ";}

2.foreach traversal can traverse associative array
foreach (int a in $arr) C #
$arr =array ("A" =>10, "B" =>20, "c" = "Hello", "D" =>30);
foreach ($arr as $value)
{

echo $value. " <br/> ";

}

foreach ($arr as $key = $value)
{
echo $key. " --". $value."   <br/> ";} Traverse Key and value

3.each () function
$arr =array ("a" = "Hello", "b" = "Lily", "C" and "Love");
Var_dump (each ($arr));//returns the key and value of the element inside the array, first takes the first one, second takes the second one ... Take the value down one at a time.

Var_dump (each ($arr));
Var_dump (each ($arr));

4.list () function is a very special function, the function on the left
$arr =array (10,20, "Hello", 30);
List ($a, $b, $c, $d) = $arr;//Assign the values inside the array to the variables in the list function and only iterate through the indexed array
echo $a. " <br> ";
echo $b. " <br> ";
echo $c. " <br> ";
echo $d. " <br> ";

5.each () and list () iterate through the array.
$arr =array ("a" = "Hello", "b" = "Lily", "C" and "Love");

while (list ($key, $value) =each ($arr))
{
echo "{$key}--{$value}<br>";
}

6. Pointers
$arr =array ("a" = "Hello", "b" = "Lily", "C" and "Love");
Var_dump (current ($arr));//Take the value of the position of the present pointer
Next ($arr);//Adjust the pointer to one
Var_dump (Next ($arr));
echo Key ($arr);//The key that points to the position of the current pointer
Var_dump (Key ($arr));
Prev ($arr);//Move the pointer up one
Var_dump (prev ($arr));
End ($arr);//Adjust the pointer to the last
Var_dump (End ($arr));
Reset ($arr);//Reset the pointer
Var_dump (Reset ($arr));

$arr =array ("a" = "Hello", "b" = "Lily", "C" and "Love");
while (Next ($arr))
{
echo Key ($arr). " --". Current ($arr)." <br/> ";
//next is the beginning of the next index of 1, so a "=" and "Hello" will be omitted, so use Do{}while () to perform the condition first.

do{Echo Key ($arr). " --". Current ($arr)." <br/> ";} while (Next ($arr))

$_get $_post Store The value that the page passes over, method= "POST" in the form form

Var_dump ($_server);
Var_dump ($_post["UID"]);//Store the value of the variable passed over the page

Var_dump ($_get[]);
$arr =array ("AA", "BB", 5,5, "CC", 10,10);
Common functions
Var_dump (In_array ("AA", $arr));//Determine if there is a value in the array

Var_dump (Array_reverse ($arr));//Flip Array

echo count ($arr);//Returns the number of array elements

$attr =var_dump (Array_unique ($arr));//de-weight

unset ($arr [0]); To delete an element in an array

Var_dump ($arr);
$arr =array ("AA", "BB", 5,5, "CC", 10,10);
Var_dump (Array_unique ($arr));

$attr =array_unique ($arr);
Var_dump (Array_values ($attr)); Re-index

$attr = Array (1,2,3,4);
$arr =array ("AA", "BB", 5,5, "CC", 10,10);
Array_merge (SHUZU1,SHUZU2);//merge multiple arrays into an array

Array_push ($arr, "DD"); Append an element to an array

Var_dump ($arr);

Two-dimensional arrays
$arr =array (
Array (+/-),
Array (4,5,6),
Array (7,8,9));
Var_dump ($arr);

Example shows the form of a two-dimensional array as a drop-down list
$attr =array (
Array (' 001 ', ' Han '),
Array (' 002 ', ' Miao '),
Array (' 003 ', ' hui '),
Array (' 004 ', ' Uighur '),

);
echo "<select>";
foreach ($attr as $value)
{echo "<option value= ' {$value [0]} ' >{$value [1]}</option>";}
echo "</select>";

Display the contents of a two-dimensional array as a single table

$attr =array (
Array (' P001 ', ' Zhang San ', ' Male ', ' Han '),
Array (' P002 ', ' John Doe ', ' Male ', ' Miao '),
Array (' P003 ', ' Harry ', ' Male ', ' hui '),
Array (' p004 ', ' Zhao Liu ', ' female ', ' Uighur '),

);
echo "<table width= ' 100% ', heght= '", border= ' 1 ', cellpadding= ' 0 ', cellspacing= ' 0 ' > ";

echo "<tr><td> code </td> <td> name </td> <td> sex </td> <td> national </td> </tr> ";
for ($i =0; $i <count ($attr); $i + +)
{
echo "<tr> <td>{$attr [$i][0]}</td> <td>{$attr [$i][1]}</td> <td>{$attr [$i][2]} </td> <td>{$attr [$i][3]}</td> </tr>];
}

echo "</table>";

?>

<form action= "zhengze.php" method= "POST" >
<input type= "text" name= "UID"/>
<input type= "Submit", value= "Submission"/>

</form>
<?php
Var_dump ($_post["UID"]);
?>

PHP regular && Array