1 | <?php |
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8 | class Bindings |
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9 | { |
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10 | |||
11 | /** |
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12 | * An array of all the bindings. |
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13 | * |
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14 | * @var array |
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15 | */ |
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16 | private $bindings = []; |
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17 | |||
18 | /** |
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19 | * Key of the binding that would be altered with subsequent calls to a bindings object. |
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20 | * |
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21 | * @var string |
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22 | */ |
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23 | private $activeKey; |
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24 | |||
25 | /** |
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26 | * Set the key of the binding to be modified or accessed on subsequent calls. |
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27 | * |
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28 | * @param $activeKey |
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29 | * @return self |
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30 | */ |
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31 | 10 | public function setActiveKey(string $activeKey) : self |
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36 | |||
37 | /** |
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38 | * Registers a method to be called when an instance is created for the current active binding. |
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39 | * This method could be a setter or some other optional initialization method. Parameters for methods registered |
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40 | * with call that have type hints are also injected. |
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41 | * |
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42 | * @param string $method |
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43 | * @param array $parameters |
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44 | * @return self |
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45 | */ |
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46 | 3 | public function call(string $method, array $parameters = []) : self |
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51 | |||
52 | /** |
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53 | * Provides a concrete class or factory function to which the currently selected binding should be linked. |
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54 | * |
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55 | * @param mixed $value |
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56 | * @return self |
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57 | */ |
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58 | 12 | public function to($value) |
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67 | |||
68 | /** |
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69 | * Get the configuration of a binding. |
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70 | * |
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71 | * @param string $key |
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72 | * @return mixed |
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73 | */ |
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74 | 12 | public function get(string $key) |
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82 | |||
83 | /** |
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84 | * Checks if a binding exists. |
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85 | * |
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86 | * @param string $key |
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87 | * @return bool |
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88 | */ |
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89 | 19 | public function has($key) |
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93 | |||
94 | /** |
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95 | * Register the current active binding as a singleton. |
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96 | * |
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97 | * @param bool $singleton |
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98 | */ |
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99 | 3 | public function asSingleton($singleton = true) |
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103 | |||
104 | /** |
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105 | * Setup bindings from an array. |
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106 | * |
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107 | * @param array $binding |
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108 | */ |
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109 | 2 | private function setArrayBinding(array $binding) |
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110 | { |
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111 | 2 | if(isset($binding[0])) { |
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112 | 2 | $this->to($binding[0]); |
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113 | } |
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114 | |||
115 | 2 | if(isset($binding['calls'])){ |
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116 | 1 | foreach($binding['calls'] as $key => $value) { |
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117 | 1 | if(is_string($value)) { |
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118 | 1 | $method = $value; |
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119 | 1 | $parameters = []; |
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120 | 1 | } else if(is_array($value)) { |
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121 | 1 | $method = $key; |
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122 | 1 | $parameters = $value; |
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123 | } |
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124 | 1 | $this->call($method, $parameters); |
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125 | } |
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126 | } else { |
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127 | 1 | $this->bindings[$this->activeKey]['calls'] = []; |
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128 | } |
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129 | |||
130 | 2 | $this->asSingleton($binding['singleton'] ?? false); |
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131 | 2 | } |
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132 | |||
133 | /** |
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134 | * Merge current bindings with another configuration overwriting conflicting values with the new bindings. |
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135 | * |
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136 | * @param array $bindings |
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137 | */ |
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138 | 5 | public function merge(array $bindings) |
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149 | |||
150 | } |
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151 |
If you define a variable conditionally, it can happen that it is not defined for all execution paths.
Let’s take a look at an example:
In the above example, the variable $x is defined if you pass “foo” or “bar” as argument for $a. However, since the switch statement has no default case statement, if you pass any other value, the variable $x would be undefined.
Available Fixes
Check for existence of the variable explicitly:
Define a default value for the variable:
Add a value for the missing path: