PHP searching in array: checking presence of an element inside array

in_array() : Searching presence of an element inside an array

This function will return True or False based on the presence of the search element.
For string, the comparison is done in a case-sensitive manner.
The script below will create an array with some element and then will apply the in_array function to check the presence of an element.

$value=array("Rabin","Reid","Cris","KVJ","John");

if(in_array("Cris",$value)){
	echo "Cris is there inside the array";}
else{ echo "Cris is not there ";}

Checking PDO driver support using if - else

To check for different database PDO driver support we can use this code.

var_dump(PDO::getAvailableDrivers());

By using PDO::getAvailableDrivers() we can get an array of available PDO drivers, so we can use in_array() to check the presence of SQLite inside the array and if-else to display appropriate message to user.

<?php
if (!in_array("sqlite",PDO::getAvailableDrivers(),TRUE))
{
 throw new PDOException ("Cannot work without a proper database setting up");
}else{
 echo "<font color='green'>Database setup is OK</font>";
}
?>

$strict=TRUE

$a = array('abc','4.56', 4, 1.13);
if (in_array(4.56, $a, true)) {
    echo "4.56  found with strict check";
}else{
	echo "4.56  NOT found with strict check";
}
echo "<BR>";
if (in_array(1.13, $a, true)) {
    echo "1.13  found with strict check";
}else{
	echo "1.13  NOT found with strict check";
}

Output

4.56 NOT found with strict check
1.13 found with strict check

in_array(mixed $needle, array $haystack, bool $strict = false): bool

Function	Details
array_search()	Search for value inside Array. Returns the key if found, FALSE otherwise
array_keys()	Array of keys for matching values, FALSE otherwise
array_key_exists()	Search for key inside Array. True if found, FALSE otherwise

Array REFERENCE

Subhendu Mohapatra

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smo1234	18-06-2012
nice site