How to remove a single value from an array in php-PHP Tutorial-php.cn

How to remove a single value from an array in php

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Release： 2023-03-22 09:14:01

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This time I will show you how to retrieve a single value from an array in PHP. What are the precautions for retrieving a single value from an array in PHP? The following is a practical case, let's take a look.

1. Array arr

var_dump(arr) The value is as follows:

array (size=3)
 'delete' => 
 array (size=3)
  0 => string 'HBSFlyRecode20170222-101501.txt' (length=31)
  1 => string 'HBSFlyRecode20170222-105502.txt' (length=31)
  2 => string 'HBSFlyRecode20170222-108803.txt' (length=31)
 'new' => 
 array (size=3)
  0 => string 'HBSFlyRecode20170223-101504.txt' (length=31)
  1 => string 'HBSFlyRecode20170223-105505.txt' (length=31)
  2 => string 'HBSFlyRecode20170223-108806.txt' (length=31)
 'old' => 
 array (size=3)
  0 => string 'HBSFlyRecode20170221-101507.txt' (length=31)
  1 => string 'HBSFlyRecode20170221-105508.txt' (length=31)
  2 => string 'HBSFlyRecode20170221-108809.txt' (length=31)

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echo $arr['old'][0];
打印出: HBSFlyRecode20170221-101507.txt

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But if arr is a

object form, the print result is as follows:

var_dump(arr)
object(stdClass)[1]
 public 'delete' => 
 array (size=3)
  0 => string 'HBSFlyRecode20170222-101501.txt' (length=31)
  1 => string 'HBSFlyRecode20170222-105502.txt' (length=31)
  2 => string 'HBSFlyRecode20170222-108803.txt' (length=31)
 public 'new' => 
 array (size=3)
  0 => string 'HBSFlyRecode20170223-101504.txt' (length=31)
  1 => string 'HBSFlyRecode20170223-105505.txt' (length=31)
  2 => string 'HBSFlyRecode20170223-108806.txt' (length=31)
 public 'old' => 
 array (size=3)
  0 => string 'HBSFlyRecode20170221-101507.txt' (length=31)
  1 => string 'HBSFlyRecode20170221-105508.txt' (length=31)
  2 => string 'HBSFlyRecode20170221-108809.txt' (length=31)

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You cannot use $arr['old'][0] to get the value. You can use the

foreach method common to arr objects and arrays. Value:

function getValue($arr){
 foreach($arr as $key => $value){
  if(is_array($value)){
   getValue($value);
  }else{
   echo $value."<br>";
  }
 }
}

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If arr is in object form, you can convert the object into array form. Here is a shortcut:

1. $object_json = json_encode($arr); What you get is an object

$json = json_encode($arr,true); What you get is pure json

2. json_decode($object_json) What you get with json_decode($json) is an array object

json_decode($object_json,true) What you get with json_decode($json,true) is an array

To sum up , how to convert an array object into an array: This problem was found in the

arr=jsondecode(jsonencode(arr=jsondecode(jsonencode(arr,true),true);

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project. It is recommended that you use json_encode() and json_decode() when converting json and array in php. Add true to the second parameter, that is:

json_encode(arr,true);jsondecode(arr,true);jsondecode(json,true);

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I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!