usort

Trier les tableaux par valeur à l'aide de fonctions de comparaison définies par l'utilisateur

Nom:usort

Catégorie:Tableau

Langage de programmation:php

Description en une ligne:Trier les tableaux à l'aide de fonctions de comparaison définies par l'utilisateur.

Exemple

Utilisez une fonction de comparaison définie par l'utilisateur pour trier les éléments dans le tableau $ a:

 <span class="token php language-php"><span class="token delimiter important"><? Php</span>
<span class="token keyword">fonction</span> <span class="token function-definition function">my_sort</span> <span class="token punctuation">(</span> <span class="token variable">$ a</span> <span class="token punctuation">,</span> <span class="token variable">$ b</span> <span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span> <span class="token variable">$ a</span> <span class="token operator">==</span> <span class="token variable">$ b</span> <span class="token punctuation">)</span> <span class="token keyword">Retour</span> <span class="token number">0</span> <span class="token punctuation">;</span>
<span class="token keyword">retour</span> <span class="token punctuation">(</span> <span class="token variable">$ a</span> <span class="token operator"><</span> <span class="token variable">$ b</span> <span class="token punctuation">)</span> <span class="token operator">?</span> <span class="token operator">-</span> <span class="token number">1</span> <span class="token punctuation">:</span> <span class="token number">1</span> <span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token variable">$ a</span> <span class="token operator">=</span> <span class="token keyword">tableau</span> <span class="token punctuation">(</span> <span class="token number">4</span> <span class="token punctuation">,</span> <span class="token number">2</span> <span class="token punctuation">,</span> <span class="token number">8</span> <span class="token punctuation">,</span> <span class="token number">6</span> <span class="token punctuation">)</span> <span class="token punctuation">;</span>
<span class="token function"></span></span><mark><span class="token function">usort</span> <span class="token punctuation">(</span> <span class="token variable">$ a</span> <span class="token punctuation">,</span> <span class="token string double-quoted-string">"my_sort"</span> <span class="token punctuation">)</span></mark><span class="token punctuation"></span> <span class="token punctuation">;</span>
<span class="token delimiter important">?></span>

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