in_array
(PHP 4 )in_array -- Checks if a value exists in an array
Description
bool in_array ( mixed needle, array haystack [, bool strict])
Searches haystack for needle and returns TRUE if it is found in the array, FALSE otherwise. If the third parameter strict is set to TRUE then the in_array() function will also check the types of the needle in the haystack. Note: If needle is a string, the comparison is done in a case-sensitive manner. Note: In PHP versions before 4.2.0 needle was not allowed to be an array. Example 1. in_array() example<?php
$os = array("Mac", "NT", "Irix", "Linux");
if (in_array("Irix", $os)) {
print "Got Irix";
}
if (in_array("mac", $os)) {
print "Got mac";
}
?>
The second condition fails because in_array() is case-sensitive, so the program above will display: Got Irix
Example 2. in_array() with strict example<?php
$a = array('1.10', 12.4, 1.13);if (in_array('12.4', $a, TRUE)) {
echo "'12.4' found with strict check\n";
}if (in_array(1.13, $a, TRUE)) {
echo "1.13 found with strict check\n";
}
?>
This will display: 1.13 found with strict check
Example 3. in_array() with an array as needle<?php
$a = array(array('p', 'h'), array('p', 'r'), 'o');if (in_array(array('p', 'h'), $a)) {
echo "'ph' was found\n";
}if (in_array(array('f', 'i'), $a)) {
echo "'fi' was found\n";
}if (in_array('o', $a)) {
echo "'o' was found\n";
}/* Outputs:
'ph' was found
'o' was found
*/
?>
(PHP 4 )in_array -- Checks if a value exists in an array
Description
bool in_array ( mixed needle, array haystack [, bool strict])
Searches haystack for needle and returns TRUE if it is found in the array, FALSE otherwise. If the third parameter strict is set to TRUE then the in_array() function will also check the types of the needle in the haystack. Note: If needle is a string, the comparison is done in a case-sensitive manner. Note: In PHP versions before 4.2.0 needle was not allowed to be an array. Example 1. in_array() example<?php
$os = array("Mac", "NT", "Irix", "Linux");
if (in_array("Irix", $os)) {
print "Got Irix";
}
if (in_array("mac", $os)) {
print "Got mac";
}
?>
The second condition fails because in_array() is case-sensitive, so the program above will display: Got Irix
Example 2. in_array() with strict example<?php
$a = array('1.10', 12.4, 1.13);if (in_array('12.4', $a, TRUE)) {
echo "'12.4' found with strict check\n";
}if (in_array(1.13, $a, TRUE)) {
echo "1.13 found with strict check\n";
}
?>
This will display: 1.13 found with strict check
Example 3. in_array() with an array as needle<?php
$a = array(array('p', 'h'), array('p', 'r'), 'o');if (in_array(array('p', 'h'), $a)) {
echo "'ph' was found\n";
}if (in_array(array('f', 'i'), $a)) {
echo "'fi' was found\n";
}if (in_array('o', $a)) {
echo "'o' was found\n";
}/* Outputs:
'ph' was found
'o' was found
*/
?>
(PHP 4 >= 4.0.5)array_search -- 在数组中搜索给定的值,如果成功则返回相应的键名
说明
mixed array_search ( mixed needle, array haystack [, bool strict])
在 haystack 中搜索 needle 参数并在找到的情况下返回键名,否则返回 FALSE。 注: 在 PHP 4.2.0 之前,array_search() 在失败时返回 NULL 而不是 FALSE。 如果可选的第三个参数 strict 为 TRUE,则 array_search() 还将在 haystack 中检查 needle 的类型。