PHP array basics

  • 2020-03-31 21:07:02
  • OfStack

There are many PHP functions, and you can query the API when you need to.

 
<?php 
 
//Creates an array of even Numbers from 0 to 20 with 2 as the step size
$even=range(0,20,2); 
//Print the array
print_r($even); 
//Determines whether it is an array
printf("this number is an array:%s<br/>",(is_array($even)?"true":"false")); 
echo "<br>"; 
//The array header adds a subitem and prints it
array_unshift($even,522,54); 
print_r($even); 
//Define a variable, and then search the array, showing that the variable was found when it existed.
$sa=522; 
if(in_array($sa,$even)){ 
echo "find it $sa"; 
}; 
echo "<br/>"; 
//Search the array key
if(array_key_exists(4,$even)){ 
echo $even[4]." exists."; 
} 
echo "<br/>"; 
print_r(array_values($even)); 
// traverse Print the array
while($key=key($even)){ 
echo "<br/>".$key; 
next($even); 
} 
//Statistical array size
echo "<br/>"; 
echo count($even); 
//The sorting
echo "<br>"; 
sort($even); 
print_r($even); 
?> 

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