PHP Built-in functions are the standard functions that are always available in PHP without any special requirement like.
strlen(): To get the length of a string.
array_merge(): To merge two or more arrays.
is_numeric(): To check if a variable is a number or a numeric string.
Build In Functions List
https://www.php.net/manual/en/indexes.functions.php
<?php
// PHP Built in Function
print_r(“Hello”.“\n“);
echo (1+2).“\n“;
var_dump(“Hello World”);
echo“\n“;
$string=“OSTAD”;
$stringLen=strlen($string);
echo $stringLen.“\n“;
// Determine $value=”122″ is numeric or NOT numeric.
$value = 122;
if (is_numeric($value)) {
echo “The value $value is numeric”;
}
else {
echo “The value $value is NOT numeric”;
}
echo “\n“;