Home > Article > Backend Development > How to determine whether a parameter is in an array in php
How to determine whether a parameter is in an array in php
- PHPzOriginal
- 2023-04-24 09:09:35500browse
To determine whether a parameter is in a PHP array, you can use the in_array() function. The syntax of this function is as follows:
bool in_array ( mixed $needle , array $haystack [, bool $strict = FALSE ] )
This function accepts three parameters:
-
needle: The value to be found -
haystack: Array to find -
strict: Optional parameter, if set to true, the type will be considered when comparing values
if specified Returns true if the $needle value is found in the $haystack array, otherwise returns false.
The following is an example:
$fruits = array("apple", "banana", "orange", "pear");
if (in_array("apple", $fruits)) {
echo "苹果在水果篮子里";
} else {
echo "苹果没有在水果篮子里";
}
The above code output:
苹果在水果篮子里
If the value to be checked is a number, strict mode must be used. The following is an example:
$numbers = array(1, 3, 5, 7);
if (in_array("3", $numbers, true)) {
echo "3在数字数组里（使用严格模式）";
} else {
echo "3没有在数字数组里（使用严格模式）";
}
The above code output:
3没有在数字数组里（使用严格模式）
If the value to be checked is a string, you can do it without using strict mode. The following is an example:
$alphabets = array("a", "b", "c", "d");
if (in_array("A", $alphabets)) {
echo "A在字母数组里（不使用严格模式）";
} else {
echo "A没有在字母数组里（不使用严格模式）";
}
The above code output:
A没有在字母数组里（不使用严格模式）
In short, to determine whether a parameter is in an array in PHP, you can use the in_array() function. This function is simple and ensures that the types of values match by setting a strict mode.
The above is the detailed content of How to determine whether a parameter is in an array in php. For more information, please follow other related articles on the PHP Chinese website!