Common PHP functions

Common functions of PHP 1) the main methods of strings include strops (), substr (), str_split (), and explode (). For more information, see the official PHP Manual. & lt ;? Php *** string method: strpos (), substr (), print_r (), explode () * $ str & quot; sunofbeach & quot ;; obtain common functions of a substring in the current string in PHP

1) string

The main methods include strops (), substr (), str_split (), and explode (). For more methods, see the official PHP Manual;

 '; // String truncation $ str1 = substr ($ str, 4); $ str2 = substr ($ str, 4, 2); echo $ str1 .'
'; Echo $ str2 .'
'; // String segmentation $ result1 = str_split ($ str); $ result2 = str_split ($ str, 3); $ result3 = explode ('', $ str ); print_r ($ result1); echo'
'; Print_r ($ result2); echo'
'; Print_r ($ result3); echo'
'; // String connection $ num = 500; $ str3 = "$ str
From Hanhan $ num "; echo $ str3;

2) array

Array_push () -- used to store array values;

For more information, see the official PHP Manual;

 '; Echo $ arr [2]; echo'
'; // Create an array: use key-value to create $ arr2 = array (); $ arr2 ['H'] = 'hello '; $ arr2 ['w'] = 'world'; print_r ($ arr2); echo'
'; Echo $ arr2 ['H']; echo'
'; // Array initialization $ arr3 = array (0 => 'Jason', 1 => 'sees ', 'H' => 'hello ', 'W' => 'world', 'name' => 'shyzc'); echo $ arr3 ['name']; echo'
'; // Common array methods $ arr4 = array (); for ($ I = 0; $ I <10; $ I ++) {array_push ($ arr4, 'item '. $ I);} print_r ($ arr4 );

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